Did the allergy testing help you pick out certain cat foods that he would be able to eat? Right now chicken, fish, turkey, and beef are pretty much out for Leo. I have to feed him either rabbit, duck, or venison and duck is the only one he will stick with. I know what you mean about cycling through foods- I've spent a fortune on cat foods. Yes I've been to the IBD kitty site. My previous kitty had IBD that morphed into intestinal lymphoma. Leo's specialist says she can't give him pred due to the fact he's on a blood thinner for a previous blood clot. His IBD right now is considered fairly mild but I know it can change and progress.
Pepcid twice a day is what he is on and Metronidazole if needed for diarrhea. I give him probiotics too. I think I will look into the allergy testing (as soon as I recover from the cost of this recent diabetic testing, insulin, added stuff needed, blood work etc.!) Yikes!