Buy the book "Headache in the Pelvis"
Here's what the book will suggest: you got some sort of infection or swelling for who knows what reason. Because it's in an area of your body that you feel particularly fond of/protective of, the discomfort makes you clench your perineum--the muscular pelvic floor. Eventually, the discomfort from the original issue goes away as it heals, but you end up with muscle soreness from endless clenching, so you keep clenching. Most men don't even realize they HAVE a pelvic floor (us women are all too aware that we have one!) so they're unaware that they're clenching it and therefore can't release it. The book tells you how to release the tension.
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food