I've never experienced it, but have gone through it with friends, and I can tell it's not an easy thing to overcome.
"It makes me feel relaxed and in charge of myself. The physical pain of hurting myself helps override emotional pain. Most of the time I do not realize I'm hurting myself until after I'm done."
"It is a release. From everything. If my day sucks or I think I screwed something up - it can make it OK and I can stop beating myself up in the head about whatever I thought I did that was so terrible. Or, if I'm having a good day, I don't quite know what to do with that either. I guess it's how I feel things."
It hurts so much in my head. No matter what I say, how I say it, who I say it to ... the pain is indescribable. It's a pain that makes no sense. It's something that asprin doesn't cure. I don't understand it, and I don't know how to stop it.
The only time I can understand it is when I can equate it with physical pain. Physical pain ... that's *real*, that's tangible. That makes sense.
That makes the faceless emotional pain fade to the background and cease being so important.