[bpaley]

Everyone is addicted to something; but not everyone has the courage to talk about their addictions. Admitting you have an addiction is the first step to ending it.
Have you considered typing your school work? Of course, you will need to ask teachers if it is alright. Most likely they will say yes as long as you can print the assignments.
You can also try to do a substitution;for example, whenever you get the urge to swing a pencil, maybe drink some water, or do a few jumping jacks.
This may be hard at first, but " if you will it, it is no dream."
GOOD LUCK