I am so sorry that your baby is sick. It makes me mad that you have such a greedy vet. A simple blood test, which should not be expensive, could tell them a lot and also whether Cat has leukemia. I would not give up yet. You are doing the right thing by keeping him hydrated. You should be very careful about how much and how often you give him aspirin. Do a Google search on cats and aspirins. They don't metabolize aspirins well. Definitely look for another vet. I would ask around to my friends and find out where they take their pets. I will keep Cat in my prayers!

Mary