I have had quite an ordeal with my IUD. Can't be on pills anymore as they mess me up, so decided to try an IUD. My doctor didn't tell me until the insertion day that for women who haven't had children it may be very painful at insertion and for a long time afterwards.
So I went ahead with it anyways (couldn't let $100 to go to waste). Didn't faint, but was in A LOT of pin during insertion (they weren't sure they could put it in even with cervical dilation pills taken a few cours before the procedure) and for the rest of the day. Next two days were manageable with painkillers, then on the fourth day I thought I was going to die. After about three hours of intolerable pain to a point of throwing up I decided to go to emergency, and as soon as I got out of bed, the pain disappeared. Go figure! Ultrasound next day showed IUD was still perfectly in place.
I was in a lot of pain pretty much every evening for the three month afterwards, and any time I did any physical activity like running, doing squats, abs and, of course, undulations. There were a few nights where I told myself I'd call the doctor the next morning to get it removed cause I couldn't take it anymore, but then the morning would come, the pain would subside and I feel bad about wasting $100 again (yes, I'm very cheap when it come to anything other than bellydance items :)
I'm pleased to say that I won the battle over my uterus! Now I have to undulate for a long time before I feel any discomfort, but it's not that bad. The pain tends to only come back during the period.
Overall I'm happy I have it so that I don't have to worry about certain things
For those of you considering geting one: if you had children, you're likely to be Ok, for those who haven't - it might be tough. Oh, and MAKE