I was just diagnosed with endometriosis. I had phantom pains in the pelvic area, usually my left side; HEAVY periods; insomnia; etc. The solutions that I was presented with were birth control, which I've learned in the past don't play well with my body; or a proceedure called Novasure (www.novasure.com). I chose the Novasure and had the procedure done last week.
There could be some other things going on. Could be ovarian cysts, fiberoids, a bacterial infection, or even a kidney infection. Have you talked to your regular dr. about it? My regular dr. had uncovered some things during my physical in Nov. She put me on meds. When the symptoms didn't go away, she ordered a pelvic ultrasound and sent me to my OB. She said that the OB would want the ultrasound for assisting in a diagnosis.
I would contact your primary dr., meet with him/her, and ask about a pelvic ultrasound before meeting with your OB.
M.