The Urine has blocked me

OK...so no leavie on July 4th...Buster the cat has a urinary tract blockage. Poor thing. Every year he gets it late spring or early summer. Went to the vet Sunday morning and got some anti-biotics and some steroids to relax things down there for him. He seems to be doing better but need to watch him. Thank God there was a vet open today. Last year he got blocked over Memorial Day weekend and he had to wait (hold his urine) for nearly 36 hours. I thought he was going to die, he was in so much pain. Yes there is a surgery to basically make him a her but the odds of it working aren't the greatest and plus, as a man, well, I don't think I could do it to him. Hope he gets better!