I’ve experienced a lot of terrible pain in my life, including a small third degree burn, serious crashes while bicycling, dislocating a finger and then forcing it back into the joint by myself. Etc.
But nothing beats that time my brother and I were play fighting when I was 15 and one of his karate kicks connected solidly with my balls, he says by mistake. (I think I believe him! Lol)
He didn’t even hit me that hard, but I rolled around on the ground in agony for long, long minutes, and felt nauseated for something probably close to an hour.
It’s good to know the physiological explanation for that agony! I suppose the response is considered adaptive?