Severe pain every month, is it endometriosis or birth control?

You wouldn't believe how much doctors and regular OBGYNs don't know about endometriosis. I had excision surgery done to remove the endometriosis in my pelvis. I have never felt healthier in my life and all the pain has substantially subsided after surgery. It's absolutely all related- my endometriosis was covering both uterosacral ligaments (connects your cervix to bottom of spine) bladder and my entire pelvic cavity. Everything was incredibly inflamed and painful, even pissing was starting to hurt before my surgery. I had so many doctors tell me that it all couldn't be connected but I can tell you that today I feel healthier than I ever did as a teenager.