I've been self harming since I was about 10 years old.
It started off as biting, hair-pulling, and hiting various body parts against walls. This was a way for me to vent my anger and feelings of being out of control.
In 2008 I cut myself for the first time. It was more of a scratch than a cut, but it worried me that I deliberately drew blood from my own body. I promised I'd never do it again.
A few weeks later things were getting out of control, so I cut myself again.
It started to get more and more frequent. My arms were covered in scratches, so I moved onto my legs, stomach and hips.
Over time, the cuts got longer and deeper.
Now I'm at the point where my cuts are at least 5mm wide and they're very deep.
I keep cutting deeper and deeper, because the little cuts don't satisfy me anymore.
I also have a substance abuse problem, and when I've been drinking I tend to cut a lot deeper than I would if I were sober.
I'm terrified. I admit, I often feel suicidal, but I don't want to accidently kill myself whilst searching for a temporary release.

Does anybody know what it may take before I can stop?
I've tried to stop numerous times, but I'd just replace the cutting with another equally dangerous behavior (i.e. overdosing, binge drinking, self-starvation, purging, inhalant abuse).
I'm currently prescribed 100mg of Zoloft daily, and I see a counsellor on a weekly basis.