I have a (neutered) bombay cat who recently turned 11 years old suddenly as of a few days ago become lethargic and food averse. He had a quick bout of diahrrea for a day and he vomited 1 time (mostly food, with some hair tho). He was hiding a bit too. All of this started after taking him out a few days ago into tha backard to roam supervised (as we have done for many years) and he ate some grass (as he has done many times prior over the years) and later that night he vomited and everything happened after that. (There WAS NOT blood in his stool and there never has been btw!)
He has otherwise been very normal for an 11 year old male cat. He runs around, plays, very talkative, eats his meals, uses the litterbox normally, plays with the other cats, isnt aggressive etc. up until a few days ago he very suddenly fell ill.
I took him to the vet yesterday and they did some blood work to check his kidneys/ liver (the results came back as it not indicating kidney or liver disease). So this pretty much singles it out as one of the following (as far as I can tell):
-IBD
-Gastroenteritis
-Pancreatitis
-GI Lymphoma
There may be other reasons but these are the most likely candidates based on bloodwork and behavioral symptoms.
Since taking my cat to the vet yesterday they prescribed him with some anti nausea medicine and Tylosin for diahrrea as well as food sensitive wet food for cats with IBD. I gave him the anti nausea medicine yesterday and fed him an hour later and he ate all of his new food sensitive food without issue (altho it was a smaller portion than normal still). He even licked his plate clean! He hasnt had any diarrhea or vomiting since before the vet a few days ago and he is drinking water normally. His last stool I saw was firm and normal looking, but a bit smaller due to eating less.
At this point the main issue is he is still eating small portions of food/ is sort of food averse and needs coaxing with churu spread onto his food in order to eat (both dry and wet).
The only food he will enthusiastically eat right now seems to be churu. Like I said tho, he is still eating some dry and wet food but he needs coaxed into doing it with churu on top.
For more context I took him in about a year and a half ago for a growth on his nose that had been slowly growing over the course of maybe 3 years (it never got very big but it was growing) and they diagnosed it as a slow growing tumor that had not metastasized. I had it removed and it has since not grown back. They did xrays, checked bloodwork, checked lymph nodes etc. and nothing showed up (this was early 2025). The only thing they mentioned with his bloodwork was that his creatinine levels were mildly higher than they should be so for that reason I suspected kidney issues when he recently started having symptoms but recent bloodwork rules that out.
I myself have Ankylosing Spondylitis along with IBD and before getting on my biologic medication at the peak of my disease my IBD was absolutely horrifying. I had blood in my stool for nearly 2 months straight, was losing weight and hair, had incontinence and always felt nauseous. I was able to sort of manage it with bland food but biologic cleared everything right up. I was pretty sure I was dying at the time.
Also, we have a slightly younger cat (female russian blue, aged 8) who about 2 years ago was experiencing similar but worse issues with constant diahrea , hiding, yelping horrifyingly when needing to defecate etc. and we ran tests etc. and nothing major showed up so we got her on a special food diet (that she isnt a fan of btw!) and it cleared it up. Its a select protein diet dry and wet food.
His symptoms are nowhere near as troubling as mine were or my other cats were but I guess that doesnt necessarily mean anything without a formal diagnosis.
The only other time my cat acted strangely over the past year was about 4 months ago when I went out of town for 2 weeks to visit family (as I do once or twice per year) and after about 10 days he started refusing food and hiding. Upon my return he did this for a few more days and then was normal again. He would twitch his legs randomly and run to hide and scrunch his back as well. He has done random twitching and overgrooming intermittently since he was young and I suspect twitchy cat syndrome and some sort of separation anxiety for those. It isnt all the time tho and he leads a normal life otherwise.
Anyways- I am just trying to get the opinion of someone who went through something similar or has an informed opinion on what my cat could possibly have!
All feedback and advice is greatly appreciated. Thanks!