A brilliant flash of white

I've been dreaming a lot. I believe these dreams to be working on a deep subconscious level attempting physical recovery of brain trauma suffered from multiple concussions throughout my life. The common underlying similarity among all these dreams and these injuries have always been a brilliant flash of white. You can call it blacking out and for me it always starts with a brilliant flash of white light with all physical senses maxing out and then the black out begins. Actually the black out doesn't exist until I consciously understand that there are gaps in my memory. Big gaps. It's hard to know what you do not remember. I can usually remember everything right up to the brilliant flash. Memory reboots right in the middle of a mess of pain and nausea and fear.  36 hours after a major brain impact when you can call it a headache from the concussion is where the memory returns. With over a dozen of these concussions in my past I know the brilliant flash of white light did not always mean unconsciousness and actually meant something far more scary. Functional physicality operating on a completely subconscious unconscious level. On automatic survival mode after facing significant trauma.  For me it was a direct tab to the most base of emotions, rage in particular. It always worked well for me on the football field, but in real life, not so much.