I was once skateboarding from orchestra rehearsal to the Metra station in Oak Park (IL) one winter evening. I stumbled, fell, and put out my hands to break my fall. I stood up, stretched my arm, and thought about my elbow: That's gonna hurt later. I got back on the skateboard, boarded my train, and realized my elbow was starting to get worse rather than better. So I called my roommate to have him pick me up at the College Avenue station. When we got home, I asked if I could borrow his car to drive myself to the hospital. So I did, drove to Central DuPage Hospital. It turns our I'd broken my elbow.
That was definitely not the worst pain I've felt, but I'm sharing the story to say this: the worst pain of the entire experience was twisting my arm into the right position and then holding it still for an X-ray at the hospital.