Ben, my call is this:

"its caused mostly by my anxiety amd focusing On it."
I agree.

"However, ive always pushed through this symptom as i was told that regardless of everything, walking, hard stepping, etc could not be damaging my brain even if it was causing these sensations and symptoms."
Agreed.

What your osteo told you sounds like pseudo-science to me. I walk for about 30 minutes every day and have never experienced anything resembling what the osteo said

Picking just one example: "membranes going across my head and over my dura matter had now become so tight that they were aggressively pulling on my dura matter and therefore my brain every time i stepped or felt these sensations"

In my view only somebody who knows nothing about anatomy would say something like that.