i have been suffering from this for many years. it came on suddenly at 27 and after two years of exploratory it was diagnosed as a few things: chronic pelvic pain caused by chronic myofascial pain. i am on some medication but the best thing so far in my recovery was physical therapy. not just internal physical therapy for the pelvic floor muscles (squeamishly personal but necessary) and physical therapy for my whole body. our muscles are all interconnected and our nervous system is too (like pain in your belly may actually come from your back muscles or trigger points). stress, etc... may exacerbate this condition and i know that slowly i have been starting to feel better not only over all my body but my belly as well (esp during orgasms). it's a long road to recovery but it can be done. some additional things: -make sure its not an uterine infection (or cystitis) -make sure its not endometriosis -make sure you do not have STD's (you can get this from just one person and even if you use a condom) -check your diet (as odd as this sounds it's actually important). lower caffeine intake, sugars, salts, etc... good luck and feel better soon!