Rob,
I know you have spent alot of money to help your cat. I have one suggestion that no one has offered yet and I know you don't have anymore money to spend on your cat but it might help you understand why your cat is peeing everywhere. There is a pet psyhic( that just doesn't look right sp) that several people on the board have used. She charges 30.00 for a reading. She is very good and she might be able to help you with this behavior so that you won't have to give your baby away or worse. I mean what have you got to lose with it? At worst nothing will change... at best you might solve your problem. I would also try the other things people have already suggested, like retraining your cat. Put it in a small space like a bathroom and keep it in there and retrain it to use the litter box. If it doesn't work, at least you will contain where it is peeing to one room.
Good luck
Melissa