Right after I graduated high school I was involved in a pretty bad mishap. My gf was babysitting, and invited me over. We started messing around. I ended up in a situation where my hearing was obstructed. My gf heard the garage door opening and told me to run out. She ran to the bathroom to get decent while I ran outside on the deck. Little did I realize that there were no stairs leading from the deck to the ground. Not thinking before I acted I threw my shoes over the deck, then I lept over. Time was of the essence, and I didn't want to be seen....
I knew I was in trouble when it took me a long time to hit the ground. I landed left foot first, then right foot, then on my butt. It was really hard to get up. I eventually stood up, hobbled to get my shoes, and walked over to my car (barely). From there I kept calling my gf, who refused to leave as she decided it would be a good idea to BS with the parents of the kids she was babysitting. When she got to my car I told her I think I broke my foot and back. Her response was "just put some icy-hot on it."
I made the ten minute drive home. While on my way, I called my mom to tell her I needed her to take me to the hospital. After the twenty minute drive to the hospital, the doctors didn't see me for at least two hours. Of course I had to be manipulated for x-rays before I was given any pain medicine. First I was given 10mg of percocet, which didn't even touch the pain. Then I was given a shot of demoral, which promptly made me throw up. The diagnosis was a fractured vertebrae and broken meta-tarsals 2,3, and 4.
Luckily I didn't need surgery, and I was able to teach myself how to walk again on my own. Picking myself up after the fall was probably the most difficult thing I've ever done in my life. But as far as the most painful thing, that was to come a couple months ago. (No offense to the OP) But when the aforementioned gf decided she didn't love me anymore and I had to moveout, that was certainly the most painful feeling of my life, and continues to torment me on a constant basis.