i know what you mean.... skin picking and stuff isn't particularly uncommon....
if you tend to scratch yourself at night, it can be helpful to wear gloves to bed. this also can help if you pull your hair. generally having something in your hands to play with, like silly putty, or a moldable art eraser, or stressball can help you keep your hands busy and give you something else to take out the feeling on. for biting, chewing gum or sucking on a hard candy can be helpful. again the idea being that you can't do both things at once.
for hitting, i think that working on the same sort of things that help you resist cutting will help, because its the same idea where you need to learn to respond to the situation in a different way that isn't harmful. so distractions and other coping skills will help with this (along with the other stuff)
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