Need advice, very sick cat

Ill try to be brief..15 year old cat, past two years had sneezing, runny nose and eyes and congestion. Vet kept putting her on antibiotics but never fully went away. A month ago she Was barely eating or drinking and had a swollen left lymph node under her chin, we thought tooth infection. Vet said was definetley cancer, she was going to die, gave her 24 hour pain med and sent us on our way. To me symptoms seemed like it would suggest fungal or drug resistant infection. She started going blind in her left eye and stopped eating all together, would only drink a little bit, became very lathargic and staggered around when she walked like she was drunk. I took her to a different vet who tested the swollen lymph node and gave her a steroid shot in the mean time. Within 6 hours she was eating some again, drinking a lot, and bouncing around...but the next day she was even worse. Got the test results back and although they did find a few atypical cells they mostly found a raging infection, which could cause atypical cells. So i gave her another steroid shot and she Got started on a strong dose of amoxicillin. The day I started her on those, I was certain she would not make it through the night, staggering around, starting to go blind in the other eye, stink of infection, not responding to her name being called, peeing blood, emaceated, throwing up, a thick layer of crust over her already blind eye, etc. so, since the meds she has not thrown up (thurs), and my mother has been spoon feeding her three tablespoons of food every 2 hours, she seems a touch more alert, the drainage from her nose and eye seem a little more clear and I can barely smell the infection anymore. Sooo, all of this was to ask, what else can we do for her to get her to recover from this????? We are going to start with hot packs on the swollen lymph node but other than that I'd really appreciate some advice on how to prevent her death and get her on the track to comfortably recovering. Thank you do much in advance.

You have found an antibiotic that is getting the bacterial infection, but she may also have a viral infection.  In a case like this, it's one day at a time.  Keep her comfortable, well hydrated and fed, and give her lots of love.  Steroids are great because in cats, they make them feel a lot better and improve their appetite.  Unfortunately, they also weaken the immune system over time -- but in your case, I would not worry about it.  I've had two cats on steroids for years due to recurrent bouts of stomatitis.  However, with both cat the shots have gotten further and further apart because the bouts of acute stomatitis have grown further and further apart.  One cat, who is proably 15 now, did get down to skin and bones becaue she could not eat, and the cortisone has helped her.  However she also goes on Clavamox (amoxicillin + clavulen, in humans called Augmentin) for dental infections fairly regularly.  I fully expected her to die 3 years ago when this started, but she's in better shape than ever.  I just have to watch carefully and smell her breath and look in her mouth so I know when she needs what.  I really hope your cat does turn around and live for more years.  If not, at least you are making her as comfortable as you can and treating her infection as best you can and LOVING HER, and that's all you can do.