Cystitis in cats

[Skits]

I brought in my one year old male today to the vet as we has been having a hard time peeing, and was peeing on everything in the house. He got a radiography where they didn't find any solid rocks but sand-like crystals, and then he had a catheter put in, and flushed with liquids to remove stones. They said it was a little complicated and he had to be put to sleep while doing so, but after some effort they managed to get some pee out, but think that he may have a stone stuck in his ***** which may or may not pass once he comes back. If not, he will have to undergo a surgery with a specialist to remove his ***** completely. He's being put on a special diet and will be on prazosin and buprenorphine. I wanted to know what's anyones success rate with this? Does it come back later on? How was everything afterwards, and what have you done to help your cats? My boy is coming home tomorrow, I'm really hoping all will be better.

Edit: Sorry if this is in the wrong section. If it could be moved to members lounge, that might be better.