Hi

Im going through the same thing just now with my cat, he is only 10 but has a tumour in his intestine, no biopsy has been done but the vet says its def that.

It breaks my heart looking at him and yesterday when we found out, i felt i was never gonna stop crying, the vet gave him a steriod and anit biotic jag and now he seems like his normal self.

You should really think about changing vets as it must make everything even harder, my vet is amazing and has looked after my baby since he was a kitten

take care xxx