Have you tried the cranberry treats yet? I heard they help with urinary problems. Don't know where you might buy them locally. It can't hurt. I bought mine on line. I don't buy them anymore, as the one cat that had the problem is no longer with me, but all my cats just loved them.

Sorry to hear your boy is having such problems. Ugh. It can be so frustrating.

Keep us posted.

http://www.amazon.com/Catberry-Treat.../dp/B0002TR5UM