For years I've been doing this. It's almost like an obsession. If I see or hear a word or phrase, I count all of the letters in it. Then, I always change the spelling of the word in my head to make it have doubles of each letter. I change the word or phrase until there is an even number of letters that is divisible by four and two of each letter. I often do this to the same word or phrase for hours or even all day. I do this continuously throughout the day, everyday. This has caused lots of concentration problems and I often get distressed or even panicked if I cannot manipulate the letters to be how i want them. Is there a medical term for this? Is there anything that can be done to stop it?