I have had the mirena for 3 years. I only got it because I have very bad cramps and I am not sexsually active. Through out the last 3 years I haven't had any problems with the mirena, it has helped with my cramps and it shortened my period. (3 days to be exact) for the past 2 or 3 months I have been feeling extremely naseous before or after I eat, when my bladder gets full, and it gets worse 1-2 weeks before my period comes. What could this be and what should I do?