I'm not a doctor, but i did watch alot of Squad 51, so here I feel completely qualified here:
sounds like you got prostatitis (sp?). it can be a rather nasty infection to clear up, you need to go to the MD and they'll give you some antibiotic like Cypro. but not before they give you a digital exam, so have fun with that!
Whatever it is, you need to go to the doc! its probably nothing now, don't wait until it becomes something.
KMA365!