| Sick kitty
Hi
I'm a vet tech, so I may be able to help you out, or at least give some advice on what MAY be going on. This is by no means any kind of diagnosis or treatment plan, but just my personal advice. Hope it helps.
The diarrhea your cat was having could be from stress and a new diet since bringing him home. A dewormer is always a good idea, and won't hurt if he doesn't actually have worms. I've heard of rare cases, though, that a cat can be so infested with intestinal worms that after given the dewormer, he can actually block up. A blockage is also a possibilty if he's been around the Christmas tree. Cats love to eat tinsel, garland, etc off trees, and these can also block up the intestines.
Signs of blockage include lethargy, lack of appetite, vomiting, and constipation. For now, I would get a bland canned food from the vet - most vets carry Hill's A/D, which can be good for upset stomach. You can also try plain meat babyfoods. These don't have salts, etc that would worsen an upset stomach. Also, you might try adding some laxatone (or any hairball treatment) to aide in passing foreign bits in the intestine.
If he doesn't improve after 24-36 hours, get him to a vet for an exam. If a cat goes too long without eating, they can develop a serious liver problem. The vet may want to check a fecal sample, urine sample, and do some bloodwork to see if they can find anything wrong. Checking for Feline Leukemia and AIDS is always important, so I would recommend that no matter what.
I hope this helps. I don't want to scare you, but when a cat starts showing signs of being sick, it can be serious. Try the bland diet and laxatone for a day or two, then get him to a vet right away if he doesn't improve on that.
Good luck. | 
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