Mirena and throid

I had the Mirena put in about 7 weeks after my 2nd child (July 2008). I had the bleeding like they said, about 3 months. My biggest problem is the mood swings and weight gain. I gain 14 pounds. I had my thyroid checked and that was off. I have lost some weight but it is coming off very slow. My mood swings are out of control. I tried to chalk it up to being at home with two small children everyday. But it seems like I'm not the only one that has this problem. I am not myself! I get so angry. I'm really thinking that I should have it taken out. These mood swings are making me crazy!