new at this

I'm a 25 year old female and I have been compulsively scratching my head for five years or so. This year its progressively gotten worse and I'm starting to loose my hair. I don't do this because I'm obsessing about myself, I do it subconciously and compulsively. When I made a new years resolution to stop and couldn't, I realized that I really can't control this. I can't afford therapy right now, I don't think this is due to some really profound event in my life, this just cropped up due to intense anxiety and stress. Can anyone offer advice or condolence?