Bipolar Disorder Support Group
Bipolar disorder is not just a single disorder, but a category of mood disorders marked by periods of abnormally high energy and euphoria, often accompanied by bouts of clinical depression. This is the place to talk about your experience with bipolar disorder, learn from others' experiences, and find support.
My suggestion is to work out. Start doing pushups, situps, jumping rope, running, etc and work out to exhaustion. That'll take a bit of the edge off of your desire to hurt yourself.
Good luck.