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Hi. Welcome to Just Answer. My name is***** I'm sorry to hear about this situation with your guy. How old is he? Did your vet do any blood work? Did they start any treatment for this? What was their next step?
How long ago did the vomiting start? How long ago was the last appointment where they took x-rays?
Ok. So he's been vomiting once a day or so for almost 2 months? Do you feel that he's still bright and alert and active? Do you feel that he's losing weight? Have you tried any diet changes?
That is good that he's bright and alert. As far as sleeping a lot, that is definitely the challenge with cats as that can be the normal M.O. for a lot of them! Could there be a blockage? While it isn't impossible, it seems unlikely as blockages usually have things get a lot worse in a shorter time frame than this. Could there be a stricture? That can't be ruled out. X-rays honestly can miss blockages. To further pursue a blockage, a barium series may be considered as that is where dye is swallowed and then monitored as its passage is done. Could this be due to intestinal parasites? A stool sample may be ran to screen for that. Could it be a dietary thing. Honestly, this is something that is possible and it can be screened for by changing his diet to something like a Science Diet i/d formula - one that is for sensitive stomachs. A food trial is basically the only way to screen for a dietary issue.