Trichotillomania (Hair Pulling) Support Group
Impulsive control disorder is the inability to resist an urge, temptation, or impulse, even when it may cause negative effects to the self or to others. If you or a loved one suffers from impulsive contorl disorder, join the community to find support and share your challenges with others who know what you're going through.

I wouldn't go there on thinking otherwise. I don't think of trich as a "mental disorder" far from the truth. It is a chemical imbalance in the brain that can be stabilized with diet, exercise, and stress coping skills.
Check out (cwedwards), page here on DS. He has several pages on explaining the sensory processing on the nervous system that people with trich suffer from.
I hope you feel better soon, keep positive, and happy and forget about thinking that there is something wrong with you. Hugs...