Okay, so I'm 23 years old, no children, have serious lower back problems. They gave me the mirena cause they said that I have a severe case of systs and they suspected that I might have endometriosis. I had my OP exaclty 3 weeks ago, good news is that I didn't have endo, but the removed the systs and gave me the mirena. The first week was a breeze, but since the second week I have had really excrusiating cramps, my back hurts so bad and I haven't stoped bleeding for 1 day (sorry tmi) so I went for my post op check up and everything was fine, mirena still in place, some new systs though. Any one else experiencing this? The pain is really so bad, I can't seem to go through a normal day?