You really need to see a vet, he will die if the blockage isn't removed. You an drench with things to make the urine more acidic but if he is already blocked you need to call a vet.
This might give you some ideas if you want to try and treat at home.
Greetings and welcome to BYH @Goatherder64 . Sorry this issue brought you here, but what's already been shared sounds like the issue. Here's another link about UC... Too late now as the damage has been done, but at least you'll know about the feed issues going forward and what to watch out for. http://www.ansc.purdue.edu/SP/MG/Documents/SLIDES/Urinary calculi.pdf
You need to contact a vet ASAP. UC is nasty and you cannot wait if you are not already equipped for it.
@Latestarter posted a great link, that is the same link I send to folks asking about UC.
You need to evaluate your feed, hay, and any "treats" you give to your animals. UC is caused by an imbalance of calcium and phosphorus. You want at least twice a 2:1 ratio of Ca: P