New to sight - amazed I'm not alone.

So I've seen a lot of people sort of talking about what happens with them on the forums, so I guess that's what I'll do. First of all I'm amazed there's so many people with the same problem. Between the last sentence and this I reached up to scratch at my head - which is my favorite spot along with my ears. I hate/love picking at scabs and patches of dandruff. I find it very interesting and enjoy examining what I pick off, especially if it is a big patch. I get a high when I examine it from both angles, and occasionally use the flashlight app on my table to shine light through them and examine their inner structure. However, at the same time I can't stand the constant compulsion and have tried for years and years to stop. I know it is unhealthy and can lead to a myriad of health problems, but nothing seems to stop me. My fingers are itching to scratch RIGHT NOW - literally ITCHING. "Just reach up and FEEL that spot - don't scratch it, just feel it!" but then I know I will pick at it. I find the only thing that helps most is to keep constantly busy. I have to have my computer out while I play video games in case a cinema scene comes on and I have nothing to do with my hands, or a book when waiting for a text from a friend. I have no idle time. However, I've managed to learn to type and play games with one hand in order to pick, without actually trying - I didn't even realize it. I suffer from a anxiety disorder that included depression and some bipolar tendencies, so I know this is probably part of the root of the problem. I need to stop. I want to stop. However, I'm a teacher so I don't exactly have extra funds running around for any more medication or to go see a therapist. But I desperately need help. Any tips?