@jenn: We tried to scruff him. To no avail. He takes advantage of being so thin- the slightest unsecurity on your side (as in "I might hurt him") will be taken advantage of

Ok: there was no diarrhea today- actually nothing at all, only pee. He went to the vet, got his fluids and had breakfast
He's MUCH happier now.
We are going to buy more of that chicken stuff and hope he likes it well enough to have more of it- you never know

Thanks for all your get-well wishes- Filou the monkey cat sends a little purr to everyone.