Self mutilation- I need help.?

Hi. I've been cutting on and off for about a year and a half. I have anxiety, and I also have symptoms of depression and bipolar disorder (and family history to match-- Yippee.) I've been seeing a therapist. And I've been trying my hardest to get over this. I've tryed talking to people I trust. I've tryed writing, and music and art and reading and watching movies and spending time with people. I've tryed the rubber band thing. And the ice thing. And the soap thing. I've tryed talking to people with the same problem. I have a box full of motivational stuff and a list of things I could do instead. I have quotes about "staying strong" and "loving yourself" all over my walls. I've tryed just about everything under the sun that I could find. And I still can't let this go- Every time I think I'm better it comes back. This is a last stitch effort here. I have no where to turn. What should I do? Please help.