Cat tumor. so much heartache. pls help with opinion/advice?

I would see another vet. just to make sure. but do it quickly. I am going to tell you something that may help you a bit. the prednisone is not good for anyone. or pets very hard on the liver. the throwing up could be something that caused my cat Fortune Cookie to throw up.. dry food with red dye in it. change that and the throwing up stopped. as far as the tooth they need to be cleaned. can he for sure say she has cancer. NO!!! I would not have her put down and I would be looking at some natural things that would make her better. Good Luck!!!! there will be people that answer you that do not care for animals and think that they can be replaced. that is not the way I think I think you made a promise to her and you need to keep it. She is a furry child, that how I see my babies. she won't eat make sure to put unflavored pedalite (that is given to sick babies) so they do not dehydrate. also feed her canned food so it is easy for her to chew it