That sounds spooky. Mine was over in a matter of a couple of hours or so. I was lucky it came back because I was really far from any kind of help.
One of the big dangers with concussions is that you get another one shortly after the first - the first may not seem like it was so bad but your brain can wind up being tight & swollen within the skull. The second one can kill you cause there's no more cushion.
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