Worst pain was probably when I tore my quadriceps tendon in my left leg 10 years ago. I was already at an inpatient place because I had (probably) partially tore my quadriceps, along with reinjuring my right knee that I had blasted in a bad fall 3 months before. The last two, I yelled, a lot, and very loudly. I said a lot of bad words so loudly I could be heard and understood on the other side of the facility. I've been burned pretty badly, had a blown appendix and almost died, and been shocked with 800 volts or so, and done a lot of other things to myself, and the worst were:
The quad blowout- worst pain that lasted more then five minutes. The surgery to fix it was no big deal.
When I kicked a bedframe and broke my big toe. Almost my entire foot was purple. If I stood on it, it was horrible. Took a LONG time to heal up.
I punched a hole through a wall while fighting with a guy who was trying to remove my gun (Dan Wesson 15-2) from the holster. I don't know exactly what I did to my hand, but the next day I picked up the phone and it was like a lightning bolt went through my hand. I tossed the phone across the room and rolled around on my bed yelling. I couldn't believe how bad it hurt. I had to wear this weird alum. brace thing on my hand for about 3 weeks. If I made a fist when I had it off, it was unbelievable.