birth control
"I finally had enough nerve to have Mirena inserted, but the experience took me by surprise.  I have a high tolerance for pain, but the pain during insertion was more than expected.  I also fainted.  This occurrence is rare and usually happens in only 1% of women who have Mirena placed.  Lucky me!  When I came to,  I was covered in sweat and couldn't get up.  My blood pressure and heart rate dropped to a dangerous low so I  had to sit for almost 2 hours to recover.  I was given prescription pain killers to help with the cramps and have had light bleeding since."