Suggest Remedy For Pelvic Pain

hello! im 33 years old 5 ft. 48kgs. Been having pelvic pain for the last three years. Usually triggered by menstruation, but pain persists even after, usually lasts in an average of 10 days in an average of 4 hours a day. Feels like my pelvic is contracting and squeezing that i need to have a bowel movement. I could also feel sharp pains in my anus. I had ultrasound- whole ab and pelvic but results are normal. Blood occult, urine tests are also normal. I have hyperthyroidism. My gyne is clueless. I'm taking mefenamic acid..sometimes it helps. PLease help..!tnx