I have been on the Mirena for about a year and about 4 months ago I started getting really horrible stomach pains and sometimes these same pains are in my back as well. It's like a stabbing pain. And I recently had a heavy period that lasted for almost three weeks. I've never had a period both times I've been on the Mirena and I've never had these pains before from being on it. I am also on the pill as well. I don't know what's wrong with me. Sometimes these pains get so bad they make me feel nauseous and I'm on the ground curled up. I don't know what to do?