*Possible triggers*
I cut myself for a while, but it stopped really doing anything for me. When I self-injure now, it has to be with something drastic. I've burned myself with cigarettes, cut my arm open with a rusty utility knife (that got infected...), and I've burned myself with cigarettes on my wrists, ankles and forehead. The ones on my forehead healed surprisingly well, I think that the exposure to the sun reduced most of the scarring. I'll punch myself in the face, usually in the jaw area - it's just easier to do that when I'm wigged out than to find something to cut myself with or light a cigarette to press into my skin. Probably the worst thing I've done - though I only had first degree burns from it - was pour scalding water down the inside of my forearm. Guess it wasn't hot enough. I've also punched cars, my own windshield, walls, and a few other inanimate objects I can't recall right now.
Does this help me? Sometimes. The cigarettes-on-the-forehead thing got me to stop worrying so much about what other people think about me, and got me to stop worrying so much about my appearance. I'll normally have panic attacks every now and then, sometimes for some very baffling and confusing reasons, but these have become less severe and more infrequent since I've started more serious and intensive forms of self-injury.
I know where this all comes from, too. It's not like I have a deep phiosophical explanation for this, but this dates back to when I was 15-17 and had recurrent amputation fantasies. They weren't sexual, I just believed I'd be a better person if I lost a hand or an arm or burned off my fingers with battery acid. Maybe this is more about getting validation, sympathy and approval from other people, I dunno.
Of course, I did have some pretty bizarre ideas and beliefs when I was a teenager. A couple non-drug visual and auditory hallucinations, too, but I was able to figure out what they were, although it was scary as hell having half of a grinning, bloated corpse hovering over you. The bulk of these have been in the form of shadow-people, shadow-animals, or shadow-creatures, which are apparently more common and can result from sleep deprivation. The fleshed out hallucinations were a bit harder to deal with.
At one point I was convinced I was physically dead for about four days, and projecting myself on the real world. Hey, it made sense at the time.
My only auditory hallucination was a voice whispering, "What should we do with him?" followed by a different voice saying "rice". It didn't make any sense then, either.
I'm diagnosed as rapid-cycling bipolar, but I think I'm a pretty likely candidate for some kind of personality disorder, possibly BPD. I exhibit other Borderline symptoms other than self-injury.
Again, I'm not endorsing anything, self-injury is a dangerous and potentially fatal behavior, I'm just recounting my own experiences with it.