Odin's not feeling so great today either

He has pretty terrible diarrhea and just looks like he has the blahs. I'm calling the vet tomorrow. Now I'm afraid it might be worms, but only because I can't think of what else would make him vomit and have diarrhea. Plus, his butt is no longer creating Mr. Hankey's, but sort of just - leaking (sorry) - for like two or three weeks now. I got him diapers today.