One trip to the doctor later, I have no more clarity on my foggy head-state. Still dizzy and tired when I get up, a tad better by supper-time, but definitely not my usual perky self.
Doc speculated that I might have come down with some passing virus and sent me for a whack of blood tests.
I guess my take-away from all this is no sharp movements, and always hang onto the rail when walking downstairs. Also, maybe aging ladies shouldn't do drugs, but that's a counsel of perfection; most of us have no choice.
Rain in the imminent forecast gives me a good reason to spend the rest of the day reading and keeping the cats happy. Dolce far niente!