Cat with possible IBD, confused with what to feed her. Please help.

Hi, my name is Paula and I am new. I am having problems with my cat Sasquatch. This month, we've been seeing the vet a lot. On July 1st (Tuesday), Sasquatch had a bit of runny stool so I took her to the vet. The vet put her on metronidazole for 5 days + forti flora and gave her a subQ fluid, it helped. On the 17th (Thursday), she had diarrhea and her stool had green mucus in it, so I took her back to the vet. They didn't put her on any meds, but they gave her a another subQ fluid then they ran a blood test, fecal, giardia and urine analysis and they all came out negative. Then on the 19th (Saturday), she was vomiting green mucus. Her regular vet is closed on the weekend so I took her to an Emergency Clinic, they gave her an injection of 3 antibiotics, subQ fluids and put her on metronidazole for 10 days and told me to put her on a boiled chicken diet but my cat got sick of eating it, so I gave her some some raw duck which she loves (Nature's Variety Raw Bites). Then on the 24th (Thursday), her stool has been formed, but has blood. So I called the vet and at this point they recommended to see an internist and do an ultrasound which we did yesterday and it said that she has mucosal thickening. Now the suggested game plan is for me to stop feeding my cat raw and just feed her tilapia, but her on metronidazole (Flagyl) for an additional 14 days + Enrofloxacin (Baytril)  for 30 days, continue forti-flora and Pepcid if nausea continues which she doesn't have right now.  She used to eat Rad-Cat chicken and Turkey, and I also alternate some Nature's Variety Raw Duck Bites which she scarfs down. 

Sorry, I accidentally hit the submit button without finishing my post. Would it be okay to feed by cat fish? I'm a bit scared that the doctor wants to stick with this fish diet for a few weeks because she said the chicken, turkey and duck might be causing all of the inflammation in her GI tract. The first bout of diarrhea she had last January she wasn't put on any meds, I just switched her on a raw diet and it helped that's why I stuck with it. The only change that I made within this month was I gave her some grass in the on the last week of June. When her diarrhea cleared up, I gave her a new batch of organic grass from Whole Foods then after a day or two she started having diarrhea again. Do you folks think it's possible that the grass caused all this digestive upset/diarrhea? The vet thinks not. Her appetite is actually very hearty and right now I'm confused as to what to feed her since he is recommending tilapia. If she had IBD which they suspect, a raw diet would be much better fir her, right? I would appreciate any input. Thanks!

The vet is trying a novel protein which is a common thing to try with IBD.  I don't know about fish though.  I think that most vets think in terms of poultry, beef, and fish as the three main proteins.  Kitties often have issues with tolerating beef, I know my IBD kitty does.  I would be more inclined to try something like lamb or rabbit rather than fish.  I am assuming that since you have been feeding raw you are avoiding a lot of the fillers that often cause issues.  

http://ibdkitties.net/index.html  has a lot of good info on feline IBD.  Many people have had success with using probiotics.  http://www.thecatsite.com/t/262587/probiotics-search-human-grade-and-cfus  is a rather long thread but it is a good resource for info about probiotics.  Some people have gotten results with bone broth http://feline-nutrition.org/health/feline-inflammatory-bowel-disease-nature-and-treatment.  The idea is cook the bone long and slow so that the broth contains collagen, the collagen helps seal the intestinal lining.

You could use a steroid temporarily to get inflammation under control but of course that is up to your vet.