Pro,

You are the only one who can make the anxiety of hitting your head go away. The CBT requires your focused participation. I would not worry about whether it can work 100% and just do it and apply yourself. Your perfectionism is your enemy. You have knowledge about Ritalin and such but appear resistant to knowledge of impact forces and such. The impact force of an thrown sweater would hardly register yet you got anxious. You are knowledgeable enough to know that the impact force was extremely low.