I'm sorry I don't know what to suggest here. I've never been diagnosed as having OCD. But I certainly have self harmed in the past... not any more. What stopped me was that I did permanent damage to myself. And I realized that if I kept doing what I had been doing, I could make matters even worse than they already are.

Nowadays I simply try to keep as busy as I can & avoid exposing myself to things (books, videos, etc.) that might be fuel for what drove me to begin self-harming to begin with. That's pretty-much it. When I am exposed to something I simply allow the feelings to arise & with compassion breathe into them, smile to them, & allow them to fade of their at their own pace. It is a practice that is referred to as compassionate abiding.