My sister took her cat in to get a cleaning. While there they said the cat had a couple of bad teeth so they pulled them. She wouldn't eat after that. After a day they called the vet and the vet said it was normal. Next day the cat was dead when they woke up. The vet said well sometimes when a cat won't eat it has just made up its mind to die. They feel like the vet basicly killed the cat but there is nothing they can really do.
Sorry to hear about your loss man it sucks.