Hard to rate.
When I was a kid, I once feel out of a tree and feel on my lower back strait onto a small stump (maybe 3-4 inches across). Also, as a kid, I was jumping back and forth over a hole. We were installing basement egress windows I was jumping over the hole that was dug. This particular hole had like a water connection or something, a white pipe with a white cap. Anywho fell directly on my lower back of that too.
Some years ago I was doing an obstacle course 5K and I severely rolled my ankle, but I kept going and even did the vertical wall. It didn't hurt so much that day but it hurt like a son of a gun the next few months.
Of course one can't forget migraines. Sound hurts, light hurts, the pain that you have also hurts and there's not much you can do about it.
In high school, some girl thought it was okay and funny to repeatedly punch me in the nuts. She only stopped because her brother came out and stopped her.