I need help and advice!

Hi, I pick my skin all over but 99% of it is on my head. It's getting ridiculous. for over 12 years now, getting worse. Every day, pretty much all the time - as much as I love it, it is driving me mad. Today I have not been well, and I have been on the sofa all day and I have scratched non stop. What I want to know is: 1. If this is to do with some deep down psychological thing, how do you know what it is? I have social anxiety, over think things, feel I am not up to the job a lot of the time, family issues (but who doesn't). How do you get to the root of it without seeing a therapist and re-program your mind to stop it? 2. My scalp looks so dry and flaky. Those who pick your scalp: Am I causing this in a vicious cycle or is it more likely I have a scalp condition? I don't want to go to the doctors about this - worst case they will not understand and misdiagnose my scalp condition, best case they refer me to a therapist or prescribe drugs and I don't want any of that! I am really at my wits end with this, I would really appreciate some support and advice!! I have never reached out to anyone about this before.