bobbicat,

I doubt you have Second Impact Syndrome. It is life threatening. It causes the pressure inside the head to increase to deadly levels.

You likely have Multiple Impact Syndrome which is the cumulative effect of all of your concussions and the progressively worse damage caused by each succeeding impact.

A problem I have had to accept is that I have severely reduced spacial memory. This means I will not remember obstacles that were obvious during a previous observation. To apply this to your situation: You likely noticed the overhead obstacle when the lights were on but your spacial memory did not remember this obstacle. Voila, you smack your head.

I say this to encourage you to try to learn to avoid these situations. I know I have a need to not rely on visual/spacial memory. For example, I would often realize that the low ceiling was a bad place to be in the dark. I would make an effort to find a different location.

It is a complex problem to solve but we need to make adjustments in our lives to live with our limitations.

It appears your 5 concussions took place over less than 2 years time. Is this correct?