6 days ago my cat stopped eating and drinking. he's been throwing up frothy yellow green liquid, he's lethargic but still purrs when we pet him. he hasn't gone to the bathroom. we took him to the vet and they couldn't give us a definitive answer. they ran blood tests and he doesn't have feline luekemia or FIV, they gave us prednisone to give him for his appetite but its not working. i've been trying to feed him with a syringe but he just gags and i can't get much food or water in him.his eyes are clear but they are usually closed, and he is not meowing in pain. the vet said it could be cancer but we don't know why he won't eat or drink, please help, i love my cat, he was my first child, i just don't know what to do.

