I have severe endometriosis and pelvic pain I'm having awful pre-menstrual cramps if I start birth control today will it stop my period/give me relief?

Maybe. The oral contraceptive is the first choice to relieve your symptoms. A 2nd choice is a GnRh Agonist medication that will stop your periods for up to six months providing relief as well. Consult with your GYN MD for the use of Synarel (nafarelin) or Lupron medications if needed.