Mirena and weight gain?

I got the Mirena back in November 2006 and I have gained about 20-30 pounds since I got it, not to mention I have had no periods since then. Has anyone experienced the weight gain with the Mirena? I have never had a weight problem and work out regularly, but this has zapped all of my energy also. It seems no matter how much I don't eat or how much I try to exercise I keep gaining weight which is depressing me. Also, while it has been nice to not have a period, I have times when my left lower abdomen cramps and also problems with constipation. Isn't it healthier to get periods and clean the body out? Tweet