Get it out immediately! Many women have said their problems started later after having the IUD put in. And yes you can get pelvic inflammation from the Mirena (it is even listed in their side effects). And the lowered immune system, depression, trouble sleeping, and inability to loose weight are common symptoms that many of us women have listed on this forum. In fact probably cutting back on all those calories could have exacerbated the problem since your body needs healthy foods and symptoms can get worse in a hypoglycemic state. Your health is not worth any loss in money. You are very lucky that your doctor actually suggested that it was the IUD. Good luck!