Andrew,
Actually I could not read your life's story. Many of us have difficulty following long posts unless they have double paragraph spacing every five lines or so.
Your struggles sound real to me. You got my attention with the "metal taste in mouth."
I wonder if you have a Cerebral Spinal Fluid disorder. There are some blockages that can cause problems. You also have a history that makes Multiple Impact Syndrome and Cumulative Sub-Concussive Impact Syndrome sound like a diagnosis worth considering.
Have you had any diagnostics of your upper neck? That may also be a problem.
You sound like you may express as anxious. That can get in the way of decent healthcare. The limited access to health care at PEI complicates you situation. You may find some resources at
www.onf.org. They have some good doctors in their group.
I need to think a while and try to remember some info that was posted here years ago. It addressed some of your issues.
More later.
My best to you.