I can remember many years ago falling off a step ladder and breaking the bone in my right heel, three days in hospital, eight weeks on crutches and three weeks walking with a stick, a total of eleven weeks off work, it surprised me by how much it hurt.
The most embarrassing and painful though was in the early part of last year, I had an episode of low flow priapsim, you can look it up but its an adult subject, in the end I needed to go into theatre for an operation to sort it, it had been going for 36 hours by then, that was surprisingly painful and very embarrassing to ask A&E to sort out.