Can anyone help me? What's wrong with my cat

I've had my cat since she was a kitten for about a good 4 years now. No health problems to speak of ever. She's always been pretty quiet and keeps her distance from strangers, but has always been affectionate to me. About 1 1/2 years ago I moved out of my old house and moved in with my aunt who owns 2 cats and a dog. One of the cats has never gotten along with my cat since and they always used to fight, not crazy fights but they force eachother into corners. Regardless here's what's going on. I had her fixed almost a year ago, haven't had any problems up until recently, and I don't think it has anything to do with her being fixed, she was given a checkup and bloodtest before that and had no problems. Just recently she's started to act very strange. I feel bad saying this but I've been neglecting her these past few months as far as attention. I work full time and am attending college, so when I get home I'm beat, but that never really phased her as she was always waiting in my room for me or would always come when I called her. Now she just lays around all day, I can't monitor her to see if she's eating or not, she hasn't been throwing up as far as I know, her breath smells really bad (has never smelled before whatsoever), it seems like her skin in her ears has turned yellow, I'm assuming this might be jaundice? I can take pictures if needed. As soon as my aunt gets home I'm going to discuss taking my cat to the vet immediately, I'm just trying to see if anyone has had the same problems. She doesn't seem to respond to being brushed like she used to, that was her absolute favorite, now she won't even pur, won't lay with me, just sits up staring off into space, she meows and responds to me still, but she just seems completely lethargic. She became a healthy weight if a bit chunky after being spayed (as most cats do) but now she's lost alot of weight acutely over the past few weeks, now I can feel her spine and hips when I pet her. She used to be really firm when I would pet her you know? Like she would resist my hand and feel strong, now she sorta slinks under it when I pet her, I know something is definitely wrong...

Thank you for all of the replies guys it really means alot to me. I have an appointment first thing Monday morning with a family vet who's taken care of all of our animals who's very good. The only reason I've waited so long was because the guy wasn't open over the weekend, and none of the other vets in my area are any good. As far as my cat goes I think she's about the same. I think I over-dramatized alot of things on her symptoms, but I know she's not well for sure. I went and bought her some Fancy Feasts and she just mowed one down like she hasn't eaten in days. I'm starting to think there's some kind of territorial dispute going on between her and this other cat we have, she might not be letting her eat, they all have their own seperate bowl in one room, I've seen standoffs before so I think that's whats up but I don't know because I'm not around enough to monitor that, but if that is the case I'll just move my cat to a daily feeding schedule instead of leaving food out. Atleast she's eating, I've kept an eye on her and have given her as much attention as possible. Luckily my aunt will help me foot the bill at the vet Monday, so I'll get whatever is needed done and paid for. I just really want to see a vet I know and trust, that's the only reason I've waited so long. I hope I'm not offending anyone by my untimely responses to the situation, but this is the best I can do in my current position which isn't a good one.

Okay so she just chowed down 1 1/2 cans of Fancy Feast (the kind in the plastic container, hopefully as good as it can get at the grocery store, it's like 1.25 per, pure ingredients), I hope it stays down. I haven't seen her vomit nor have I been told she's been vomiting. We'll see what the vet has to say. Has anyone had a cat just stop eating it's food because it no longer likes it? My cat has always eaten what we fed her for the past year, so either: she's sick and it's affecting her appetite to start with, 2) she no longer likes her food, 3) the other cat is stopping her from eating somehow. Again, we'll see what the vet has to say about this, if it's wet food from now on then that's fine with me, we've kept all of our animals on dry diets but appearantly that might be the cause her, we will see.

I called the vet and had her in yesterday on everyone's recommendations, I told the vet that we've been going there for some time and that I really need him and he was happy to meet me there. He gave her an IV to hydrate her, and some kind of shot, don't remember what. Got a few cans of some wet food, she's been eating 3 times a day. Also got some amoxyclin or whatever it's called that I've been giving her twice a day. She seems completely different now, I think I caught these problems in time, but only time will tell. Did some bloodwork, results came back negative for Lukemia, so that's a big relief, they're doing another test tonight for something else, gonna have results tomorrow. Like I said, she's responding much better, purs when I've been brushing her and is just alot more active, not a complete turnaround but a huge change, I think she'll be okay, definitely vigilant now, got everyone in the house to keep an eye on her, someone is almost always home, so she's being fed on time and has been eating. I'll keep everyone updated for the next few weeks.

I asked a bunch of questions, he won't give me a definitive answer until the tests are done, the tinging of the skin is liver problems yes, but until he pinpoints it he won't tell me, but he did mention fatty liver, prolly what it is. She's eating like a champ right now, not throwing up either.

New test results today. Appearantly the liver isn't that bad, they said there might be some kind of blockage going on between the liver and small intestine causing bile buildup. She has been eating, and I've moved all facilities to an isolated room so she can do whatever she has to do in peace and just recover. Still giving her wet food, I actually add a little water to it so it's almost like a paste so she's hydrating a bit better. Went and got 2 more meds today at the animal hospital, S-Adenosylmethionine and Silybin A+B, small blue tablet, that's for the treatment of the blockage, and another antibiotic, so right now she's on 3 meds twice daily. Scheduling an appointment 10-12 days from now for more bloodwork to see if anything has improved. Basically like the doctor and everyone else has said, as long as she's eating which she is, otherwise hospitalization is going to be the next step but I think we're steering very clear of that.

Haha, she has no name, it's just cat. I never really thought of a name for her, I'd always just call her kitty or cat and it stuck. Yeah it's Denamarin, 90mg tablets, little blue ones, so hard to get that pill in her, but she takes it after intense struggle. Just picked up some Meow Mix wet food, got in the door like 10 minutes ago, she's still at the dish eating. Is it a bad thing that I'm not giving her the a/d food the vet gave me? She doesn't seem to be too into that stuff, but anything else with a gravy or sauce and chunks of meat she's into, but if it's a mush she hates it.

Yeah she's eating and drinking real good, we've been watching her eat to make sure she's getting her intake. I'm starting to wonder if one of the reasons she might've stopped eating is because her teeth might be grinding. I give her wet food and it sounds like she's crunching on something, I wouldn't know because she always ate dry. I'll tell my vet about this first thing tomorrow. Does anyone know how long it takes for some noticeable results? I already have some but when does her skin turn normal color again? 6-8 weeks is what I read, but is there any faster recovery times noted?

Has anyone had to do aggressive feeding? The vet said she should do about a can a day, she hasn't been doing anywhere near that, been wasting alot of food, now I've switched over to the syringe. Making a gruel paste and feeding her that way, I just wrap her up in a towel and make her eat, hate doing it but that's the only other option besides the feeding tube, so she's going to need some tough love now.