Is anyone familiar with what uric acid crystals are?

I've been going back and forth to different urologists looking for answers as to what's wrong with my semen after or just masturbation. Yesterday, I ped like some kinda pebble like substance in my nutt and it was brown. It actually hurt when I ped it after masturbating. If anybody is familiar with this type of symptom, all feedback is welcomed. I went on the internet and looked up chronic prostatitis and there was some kinda relation to that. I'm thinking maybe uric acid crystals stem from symptoms of chronis prostatitis but I'm not sure. And there was pain after ejaculation in the testicle area. I habe no idea what's going on with me. Doctors aren't giving me any answers. Say I don't have a disease. What do u think about this?