Does anyone have any experience with a male cat having FUS?

My male cat was acting really funny and I thought since he went outside a lot he might have gotten into a fight. It turned out he had FUS, urethral blockage, renal failure, Azotemia. He was in extreme pain. On my way to the vet with him yesterday, he got away from me and ran down the road and hid in one of the drainage areas in the street. I had to check all of the drainage holes this morning and finally found him too sick to even move. This is what the doctor told me he had and I was wondering if anyone had any experience with this horrible disorder?