Suggest Remedy For Strong Pain In The Pelvic Area

I've had a problem that I consider extremely serious. For about 7 yrs now, I experience a very strong pain in my pelvic area that runs in a U shape to my rectum. After many exams the Dr's still don't know what's wrong w/ me. I have two small children under te age of five and I want to be healthy for them. Please help w/ any suggestions. Thank you.