I had something like that happen after I had the stroke. Right now, I have trouble telling time, or remembering what day of the week it is. And in the earlier days, I forgot how to do stuff I'd been doing since I was knee-high to a kitchen chair, like making pie crust. My hands forgot how to do it. I called upon the spirits of my mother and my aunt, who taught me to cook, and tried to find my muscle-memory of the task, and I got the pie made. I still don't feel comfortable about driving - I won't react fast enough, or I'll react too fast - so I'm going to find the muscle-memory from my father teaching me to drive, and see if I can get it back again.
Usually it's just stress; you DO eventually get your brain back, but it happens sort of slowly.
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Usually it's just stress; you DO eventually get your brain back, but it happens sort of slowly.