If he isn't urinating then he might have urinary calcium. You need to put some vinegar or ammonia in his water to stop it. He will basically die if you don't stop it. He can't use the bathroom so it will all build up and he will basically die.
He dosent act in pain at all i haven't noticed if he is peeing good or not he is with our littledoe we just got him the other day to keep her company he eats good and very playful he is only three months
Ammonium chloride comes in a powder. You can put it on feed or in water. Mine are extremely picky about things in their water, not sure about yours. You could probably even drench him with it. I also feed a good grain with ammonium chloride in it. Watch him closely