What seems to help many men (and women) is physiotherapy, both external (stretches in particular) as well as internal (yes, the PT goes into your anus or vagina to massage internal trigger points). It’s widely understood as a muscular issue, where trauma (such as frequent infections, frequent sitting, clenching your muscles because of frequent stress etc.) has causes muscles to tighten. It’s referred to as UCPPS these days, Chronic Pelvic Pain Syndrome. Unfortunately there don’t seem to be any PTs in Thailand specializing in this. You can find stretches on Google and buy an “internal wand” to massage the insides of your pelvis yourself. Download the book “A Headache in the Pelvis”.