@elenasparrow Welcome to connect. This is a patient forum and does not have clinicians who can diagnose medical issues. We all learn from each other through sharing our experiences as patients.

You may be interested in this link about atlantoaxial and craniocervical instabilty. The author has a presence on facebook where you may comment on his posts. I find his articles very informative. He often posts discussions on diagnostic information in his facebook posts.

"Do you really have atlantoaxial and craniocervical instability? A critical view on the overdiagnosis of AAI/CCI"
Posted on July 13, 2022 by Kjetil Larsen
https://mskneurology.com/do-you-really-have-atlantoaxial-and-craniocervical-instability/
My understanding is that there is a physical problem of rotation of the spine that stays in a rotated position that causes blood flow to be blocked in the vertebral arteries. I don't have Bow Hunter's Syndrome", but I do have some occasional slight rotation of cervical vertebrae from muscle spasms related to Thoracic Outlet Syndrome. The TOS is worse on one side with one side of my neck tighter because of it, and that causes rotation if the muscles tighten. I am able to stretch it out and resolve the issue. This has also caused some vertigo. That was prior to my C5/C6 spinal fusion surgery. Since then, it has calmed down, and I don't get vertigo. I will get one sided muscular headaches that clue me to stretch and even out the tension to stop the slight rotation that is happening.

Do you have a diagnosis of Bow Hunter's Syndrome or a spine condition?