So glad you found the cause, and are now on your way to recovery! Sometimes it can be one step forward, two steps back, but time will heal this. Many of us are vitD deficient, by the way. It has to be caused by the Mirena. I take 6000 iu per day, and it helps. I am finally in the normal range with my labs. You may want to consider that, and other supplements that others have found helpful. Good luck and be sure to post about your recovery!