StormE1

I wonder if these symptoms are a combination of your past concussion history and your current need for oxygen. You may be experiencing times when your O2 sat is below what your brain needs. Chronic O2 deprivation combines to cause dementia like symptoms. Do you use a pulse-ox to keep track of your O2 sat levels?

These same symptoms often show up when a person with a concussion history reaches their 40's.

Have you tried using a O2 concentrator or do they not provide enough O2 ?