I had a mild Traumatic Brain Injury and severe
concussion 1 year 8 months ago. Post
Concussion Syndrome followed after that
and that is what probably your cousin's doctor call it.
I have several symptoms and the worst is dizziness, heavy headed and fatigue. Been to many therapies, meds and no help. Right now I am trying some PT for my neck which seems to be causing my dizziness. I don't know and no one knows including specialists. It is tough to diagnose dizziness.