I've had two feline leukemia cats, which were born with the disorder, so have gone through the shock of diagnosis and roller coaster of caring for them just as you are now. What is your cat's name?

How long ago did your cat have his steroid shot? This should make him feel better and give him an appetite. How long has he been on antibiotics and why is he on them? Does he have a cold or other virus? As you know, his immune system is highly compromised by the feline leukemia virus and he will have a hard time fighting off any illness, so it may not be surprising that he isn't bouncing back fast. Is he eating? If not, is he getting fluids? Did your vet check your cat's gums? If they are pale, he is anemic and that's cause for immediate concern. Your cat will probably go through occasional "sickly periods" as the virus flares into greater activity due to stress, usually. With care, the cat pulls through these periods.

Please keep us posted, and good luck!