RE: IUD
Insertion was pretty painful for me, but the cramping was gone within 8-10 hours. I hope yours stops soon.
I have had mine for 7 months with no issues -- a little spotting for a week or two and then virtually no periods since. Although, to be fair, I'm still nursing and I'm one of those folks who rarely had a period in the 10 years I was on the BCP. This was one of the main reasons I chose to have mine inserted. My DH wants to get things taken care of permanently on his end, but I'm not entirely sure we're ready and I also wanted the benefit of no/reduced periods. My OB said that most folks who had reduced periods on the pill enjoy the lightened/absent periods with the local hormones the Mirena provides.
Mom to a DD (8/02) and a DS (6/05)