I'm so sorry to hear Sparkler isn't eating much, if at all. Is he drinking? There are pills that stimulate cats appetite, ask your vet about those. However, I think it's a good idea to get him thoroughly checked.

I know what you're talking about when you say you can't get hold of him. Fister was like that for years and it was nerve wrecking every time we had to take him anywhere. If you get some medicine called Diazepam - just 2-3 mg, that might calm him down enough to be able to get him into a box. Crush a pill and put inside some meat he likes.

Sending lots of good wishes and hope it's not something serious. How old is he?

(((hugs)))