my cat

I have a black male cat that was given to my daughter he started to be unwell last year I managed to pay the vet bills even though I am a single parent working but on a low income I have tried the rspca etc but I don't fit the critera as I am working if I was on jsa etc then I would get hep my cat needs blood tests to look into what is wrong with him and cant afford that I have also been told give him up to someone that can afford them which is heart breaking to do he is part of the family also my daughter will be so upset