Originally Posted by Berndiggitydog
Yes, Apricot received two vaccines, Rabies and FVRCP vaccinations at the same time as the neutering...
I think that's most likely the source of the problem. Vaccines can take quite a toll on a cat while their immune system kicks in to make antibodies. Preferably, multiple vaccines aren't given at the same time (that especially applies to the rabies vax), and also not administered while kitty undergoes a surgical procedure. I realize that isn't always possible, but that might be something to keep in mind for the future, given Apricot's reaction. I have a feral cat that was recently spayed and concurrently received the FVRCP vaccine (because there was no way I'd be able to get her to the vet on 2 separate occasions), and it hit her really hard. She completely stopped eating for 3 days, and it was about 10 days before her appetite came back enough that I wasn't worried anymore.
Glad to hear that Apricot is eating a bit more! Hopefully he keeps it up.