Yeesh.
I had a case of nose bleeds a couple of years ago.
Because of it, I had to have the inside of my nostril cauterized to close the broken blood vessels. HURT. LIKE. ELMO. Felt like I was being electructed through my nose, almost as if the doctor was basically taking a bunch of wasps and having them sting me in my nostril.
Needless to say, I try very hard not to pick my nose, or even blow it unless absolutely necessary... but then again, the ear/nose/throat doctor is a but of a sadistic creep anyway.