I don't have Tourettes, but I am a drug addict. I can relate to what you said about it being voluntary but compulsory. Although I know no one believes that using heroin is involuntary, I know they wonder why I don't just stop. And I wonder, too.
So is it the same as an addiction? I know drinking soda is addictive. I would not say it is voluntary since the urges are not coming from me but rather my mind. The first few times it was voluntary. Not anymore. I cannot just stop cold turkey or the cravings will be quite bad. Instead I'm weaning myself off of it.
So do > 35% of Americans who are obese. Why don't they just stop eating? That's over 100 million people.
Would be interesting to hear your story. It sounds like a very good description, this "voluntary but compulsory". Would you mind to share more?