High possibility of FIP.. (Feline Infectious Peritonitis)?

My cat who is just under a year old may have FIP. I'm currently waiting for the serum protein electrophoresis test results to come back to diagnose his illness. Although there of course, can be a chance that it is something else, judging from his symptoms and condition I can't help but conclude myself that it is FIP. For those who have cats with FIP or had, were they able to miraculously combat this fatal disease? How did you help care for your sick feline friend? It really is hard just basically waiting for his death..I feel so helpless and don't know what I can give..I received anitbiotics from my vet (Bioclav) to feed him in hopes to make him feel better but as he currently isn't eating (have to syringe feed him) everytime he takes the medicine he vomits within a few hours. He is extremely boney (basically skin and bones) and with all the vommiting he really doesn't get anything even with the syringe feeding. I'm planning on hospitalizing and putting him on fluids in hopes that he'll be able to get some kinds of nutrients in him. If you have any suggestions, advice, or stories to tell please don't hesitate to reply. This is a very serious and heartbreaking matter and I would appreciate it if your comments/replies were understanding.