How soon after its first insertion did you start feeling the side effects due to your bodies rejection of it?
I had to look up Mirena because I'd never heard of it. Here's part of what I found:
"It is highly effective at preventing pregnancy, but some women may experience dangerous, life-threatening side effects such as perforation of the uterus, pelvic inflammatory disease and ectopic pregnancy (pregnancy that occurs outside the uterus). The device may also spontaneously move from the uterus and embed in other parts of the body such as the uterine wall or abdomen, requiring difficult surgery to remove. Women who have experienced some of these side effects filed lawsuits against Bayer claiming that the company did not properly warn of these side effects."