I had the Mirena for a couple of years, and I experienced a lot of pain both during my period, and also with any kind of arousal. This was all before my pregnancy; I’ve read that Mirena might not be the best choice for women who have never had kids. After I had my daughter, I switched to Skyla, which was great compared to Mirena. I think the IUD is one of the best BC methods available, so if Mirena keeps giving you problems, see if you can switch to Skyla.