The one thing I haven't seen anybody say, yet (unless I missed it), was dehydration. It's very easy to become dehydrated (sometimes, having Diabetes, and other things, causes it----like, I often notice, by their tongues, that singers on TV are dehydrated [the hot lights does it - and also, their horrendous schedules / no sleep, etc.], and worry that they're gonna pass-out----but, sometimes, it's just not getting proper nutrition / enough fluids, in ya). Does your tongue look anything, like this:
If it does, get the biggest bottle of Gatorade that you can find (any flavor), and drink it----you don't have to down the whole bottle, at-one-time; but, like, you should drink it, at the very least, over the course of a day, for instance. If you don't want / can't have the sugar, they have bottled water with electrolytes added, and that should do it----and then, if that does the "trick" (alleviates your dizziness), try to remember to be mindful that that can happen, and to take steps to not let it happen, again (ie, consume more fluids).
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White female; age 59; diagnosed Aspie.
I use caps for emphasis----I'm NOT angry or shouting. I use caps like others use italics, underline, or bold.
"What we know is a drop; what we don't know, is an ocean." (Sir Isaac Newton)