What is the worst physical pain you've ever been in?

When I was about 18 I would get severe abdominal pains and end up in the hospital barely conscious. The doctors could not figure out what was causing the pain because they would press into my abdomen looking for abnormalities and the pain would disappear. A few months later I would be back. Eventually one doctor figured out it was appendicitis that didn't present itself like appendicitis. They took my appendix out and I have been pain free ever since.