Please think of my sick cat, Ficus

I don't generally do this sort of thing, but my 8 year old cat, Ficus, is in the vet hospital tonight.  He's been very sick since he got his vaccines last Tuesday... not eating, not drinking, and vomiting after he's force fed.  I've had him since he was six weeks old, and he truly is like a child to me.  So far all the tests have come back negative, but they're running two more tonight and are going to do an ultrasound on him.  I can't afford to have him put on a feeding tube, especially if there's "nothing wrong" with him.  Please, keep Ficus in your thoughts and hope he regains his strength and will to live.  I love him terribly and don't know what I'll do without him.