birth control
"Now, I consider myself someone who has a pretty high pain tolerance. I love needles and piercings and tattoos and have dealt with some pretty severe injuries. I have felt pain. 
The physical insertion was only slightly uncomfortable and lasted only a few seconds. 
However, the cramp I felt after was one of the most painful things I've ever experienced. I sat lightheaded, sweating and almost crying in the room for 5 minutes after. I walked out and it was all I could do not to pass out while simply booking my next appointment. 
I went out to my car and turned on max AC and laid my seat back for a good 30 minutes. 
Mild cramping next few days. All in all most painful thing ever but only lasts like 45 minutes."