Self harm problem...whats gonna be the last straw?

I used to cut and bruise or starve myself but with some help was able to gain some ground with it. But I also struggle with bipolar II disorder, borderline pd and anxiety. I tend to be/get a bit obsessive compulsive. Right now, I am obsessively compulsively overdosing on acetaminophen. Not in fatal amounts but dangerous. I've been doing it for just over two weeks, I think because its an invisible way to punish myself, and I'm now up to 15 500mg equate pain relievers, taken in doses of 5 to 7 throughout the day. I've been struggling! How do I make it stop?