I am one year into my second placement of the mirena, and have been reading alot of your comments. So far I like the mirena, but your post does help me in figuring out my weigh gain. I exercise everyday and although im not the healtiest eater, i don't eat much. So i fiured that my junk food and eating was the problem. I have also experience sharp faintness spells that come and go (not that often). I could remember asking my doctor about my weight gain and she said that my body was changing due to age, ( I was  30 thats been over 6yrs). I sometimes have pregnancy symptoms. Im always bloated. I do like the fact that i don't have to worry about getting pregnant. Even though this weihgt gain is frustrated, i don't have many other issues with the iud.