Well, I am not going to baby you and tell you not to cut... You have come so far wtih three months, I am quite impressed. Anger is an issue, annoyance is an issue... Can you find other ways to throw that anger around? I shoot guns at targets and junk, and that is how I get a lot of it out, but I am also responsible around a rifle...
Another thing I tried once, was a little physical exercise, abuse yourself this way, or abuse yourself at work... really push yourself and see how you feel, don't do it too much though, at the moment anything else is better than cutting into your skin... Just remember, if you make the same mistake as I did, what are you going to tell your kids when they ask about the scars...

Take care, things will head up eventually
I am here.
-Brandon