Ben, Busted. T was right. Ben E....... is you. It appears you are also Ben A.. and maybe James G.... Every single question they asks on Quorum, you have asked a similar question on NT.

Wow, You have been asking a lot of anxiety ridden questions.
You work hard at reinforcing your anxiety.

I went onto Quorum to see who answered your questions. Dr Condron is no concussion specialist. He is a pathologist. He looks at slides all day. We discussed the need to vet the expertise of doctors who answer such questions.

You need to take the list of questions you asked on Quorum to your therapist. You need to have a hard discussion.

btw. The answer about your cousin by Dr Condron likely referred to the risk of hitting/banging his head when he whips his head. He replied to 'whipping or banging' his head. But again. Dr Condron is a pathologist. He does not work with patients.

As I told you, this movement is called stimming. (stimulating). He likely does it to get a sensation that settles the current crisis. The biting of the hand does a similar function. Some ASDs will actually hit their heads against the wall. That is potentially damaging. But, as soon as they feel a sensation from the action, they usually stop.

I'm tempted to post a link to your Quora questions. Out of respect for your need to address these questions with your therapist. I am not going to.

A neurologist from UPMC (top concussion hospital in the world) even told you to get help with your irrational obsessions.

Have you ever checked out YouTube's Al Lumnah to see how he has established his life as someone has serious struggles with anxiety? Spend your online time doing productive things like seeing how others live a low anxiety life. YouTube has a huge Homesteading community of people who have rejected the hustle and bustle of life to find a calmer way to live.