Thanks to the Internet and particularly Wikipedia, I was able to identify my decease. It is called trichotillomania and it is probably my reaction to stress. Since the stress causers are not likely to reduce unless I change my life style, I will have to search for some treatments for it. Any advice is welcome!

P.S. Never buy a laptop with a German keyboard, it is unbearable for a computer scientist! (",/,\,|,[,],=,ctrl+z,etc.)