I don't think any of what you have said as the basis for your worries have any validity. "An earlier comment of yours in this thread just seem to mention that repetitive forward and backward movement of the head seemed to cause cumulative trauma and so this worries me since I believe it then poses a greater risk of injury than that of turning the head side to side. " I did not say that repetitive forward and backward movement can cause damage.

If you spend a few minutes vigorously shaking your head front to back, up and down or side to side, it could cause concussion like symptoms. But, I know you would never do that.

I bet the responses you are feeling have more to do with the inner ear.

Small momentary changes in blood pressure to the head and face are common as the blood vessels respond to different head positions. This happens with everybody. It is not a response to protect against damage. It is a response to keep adequate blood flow so one does not pass out from lack of blood flow.

So, yes, that weird sensation is harmless.

You really need to find somebody to help you let go of these worries so you can get on with living your life.