Thank you for the reply.

I am considering seeking some therapy - I've never addressed this before at a clinical/professional level. I find that when I do abuse substances or alcohol (really talking about pot and alcohol) my anxiety level goes up enough that I take it out on my hands.

The hours later I'm very regretful I have laid waste to my knuckles.

It takes a great deal of willpower to consciously not have me bite my knuckles. Does hypnotherapy work?