I second the recommendation of an ENT. Or you might take him to a hearing and balance clinic (hearing aid clinic). Sometimes, the non-MD will have a better understanding. Many MD's are so quick to jump to conclusions.

The vertebral artery issue is an interesting suggestion. I have suspected a vertebral artery problem in my neck but have not been able to get any help from the doctors.

Jo*mar, what kind of specialist did you see to resolve you vertebral artery issues?

I have a good PT who helps with my TOS but not the brain blood flow. I get tingling on the left side of my head. It seems to coincide with a pressure (inflammation) at my left occipital condyle.