Mirena Mood Swings, Excruciating Pain, Wedding Dress, Fiance, Fibromyalgia

I am a 19 year old with fibromyalgia that makes it deadly for me to get pregnant; carry past three months. My periods were irregular(I started at 6) and would bleed heavily for weeks. So I got Mirena in August 2009, and it has been hell. When I got Mirena I was 136, today at this post I am 180 pounds and it won't go away, I've been dieting also. I haven't changed my lifestyle drastically( I barely eat now as it is), I walk three times a week which is painful, and my migraines have spiked horribly. The day Mirena was placed I bled heavily and for two weeks, until my period stopped. About two months ago, I started having cramps and excruciating pain in my tummy. My doctor told me that a few females with Mirena, the same day as me, and chose to take theirs out, which relived their pain. My fiance' constantly complains about my drastic mood swings, rage, and depression going on.Also I'm in college and mostly can't even operate, feeling dazed. I actually need the Mirena, but want to take it out because of the horrid side effects;how the fuck am I supposed to fit in my wedding dress now??!!