I have had tension headaches that have left me utterly unable to move, think, talk, etc. I could only rock in agony on my bed, wishing for death, or unconsciousness. Unconsciousness found me first.
Going unconscious from a headache....pretty brutal.
More "physical" types of pain, would be my ingrown toenails. I've lived and dealt with them since I was in highschool. I've gone to concerts, and been in mosh pits, jumping up and down, and having large men jumping up and down on my feet. Never really felt the pain, due to the "hype" of the concert itself. To be honest, I'm pretty sure that the average pain I do feel from them, would probably have most people wondering how I walk...and I don't even notice it any longer. There are days though, when after work and riding the bus, when my toes start to relax, and then I have to walk home from the bus stop? That time of low pain, lets my brain adjust, and then it hurts like hell.
Most telling however, is when I did have my toenails removed, or when I had the sides cut off, and removed (That was done without anesthetic, and didn't hurt much, surprisingly). That freedom from pain, makes me feel so much different. Buuut...then I keep forgetting to go back and get the nail growing cells cauterized. Cause I'm smrt.
But otherwise? My pain tolerance is quite low, especially for self-inflicted. If I have to do something to myself, I swear the pain is always sharper, more cutting, and more intense. Just a mindset thing though I think, when someone else is doing it, the pain just....is muted?