Self-harm is really the result from an unresolved depression, that is basically physiological in nature. To stop cutting one-self one need to treat the underlying symptoms of depression due to an underlying biochemical imbalance.

Please read:

What is Hypoglycemia?

The Serotonin Connection ----> here

Depression is a Nutritional Disorder

and ask to be referred to a Nutritional Doctor or a Clinical Nutritionist.