Geez, that's awful!! Thankfully I had no pain at all during insertion. I actually had no complaints at all about Mirena until a few months ago when I got tired of bleeding all month. Then after the midwife tried to remove the Mirena & couldn't reach the strings, I started having these uterine spasms that felt just like a baby kicking. I figured it had to do with the Mirena & started looking up side effects & found this page. I realized then that I did have some side effects (acne, hair loss, feeling pregnant), although nothing as bad as many people who have posted here.
Because I really had no problems until she tried to remove the Mirena, I have to think she must've pushed it up inside my uterus, which is why the dr last week couldn't find the strings at all, even with a special instrument. Since then, I've been crampy & sore & still having spasms, but no real pain, so I'm hoping that means the thing is just floating around inside my uterus, and not outside somewhere.
I wish you the best of luck with your situation! Every time I read this page (and others) I just can't believe the things that are going on with the Mirena, and worse, that doctors are so inept at inserting & removing it & recognizing relevant side effects.
Here's an "interesting" article I found while searching for info about a lost IUD: