I would be demanding something to be honest. Snowy ended up at the vets due to sickness 5 months after I got her, she had raised liver enzymes which the vets didn't seem to really say much about - this was before I had the internet, so couldnt do the research. She hated prescription food, and I used tuna and cat milk to help build her up, with prescription food when she was having an off day. That was in JAn, and at the end of November, she was having a really bad week, so I took her back to the vets (she had had 2 other blood tests throughout the year) where she was diagnosed with cholangiohepatitis, which can be treatable in cats. Sadly, Snowy decided to refuse taking meds, hide from me and stop purring, so I opted not to put her through anything, hence being told there was nothing more they could do, and it was up to me when to let her go. On New Years Eve, I took her for sub-q fluids, and a different vet told me she wouldnt be suffering, but would feel like she had the hangover from hell - I then went out drinking and got a major hangover, and then made the decision, I couldnt put her through that. BUT, there is at least one cat on here who has survived cholangiohepatitis, so even if that is the diagnosis, it can be treated, and the liver can regenerate. Snowy was around 14.