I Was In An Auto Accident 6 Years Ago And

I was in an auto accident 6 years ago and among many other injuries suffered a sub dermal brain hemotomah....forgive the spelling...periodically over the past several years I have 3 to 4 day periods, maybe once a year where I have a strange issue...it begins with a tingling in my nose almost like smelling faint ammonia or horseradish and then I get this overwhelming sense of deja vu followed by about 30 seconds of losing touch with reality...at the end I break into a cold sweat and less often feel nauseated....my doctor thinks (I visited with her 2 years ago and she was not alarmed) that it is post concussive brain trauma...your thoughts