Although my symptoms are somewhat different than yours, my back (SI joint) and chronic pelvic pain began after gyn surgery (a hysterectomy and ovary removal). My meds are Lyrica, Topamax, and the Duragesic patch w/Percocet for breakthrough. The next step in pain-management would be for you to ask your doctor about a patch that would cover your pain 24/7. In order to do this, you need to be tolerant to the Percocet first. If your pain is not resolving with time I would ask about this. Best of luck to you. Lisa.