SOC
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My orthostatic hypotension (not hyper) was immediate upon standing. After a few seconds, I'd normalize. There were also a few times when, after standing still for awhile, I'd start to get nauseous as if I was going to pass out. Simply moving would normalize things.
But it sounds like your system responds by compensating with higher and higher BP and HR to keep supplying your brain - maybe the amount of blood pooling in your legs steadily increases? Do you get steadily increasing edema?
A person who is hanging from a rope attached to a safety belt will pass out rather quickly, simply because they cannot take the pressure of their whole weight being borne by the midsection. So elaborate harnesses were invented instead, in which case the suspended person will pass out after 10-20 minutes or so - because the legs being suspended don't return the blood up through the veins so well. That's true in normal, healthy persons.
No, I don't get edema, but my leg muscles tighten intensely and I can't relax them -- when standing without moving, that is. If I move, the BP/HR still go up, but the muscles don't get so tight. I'm guessing that the tight leg muscles are my body's way of preventing blood pooling and edema. Just a guess, though.
In the early years, I didn't have NHM or POTS to any noticeable degree, but my BP ran low. I also had a few events like you mentioned in your first paragraph. The POTS and orthostatic hypertension developed later -- maybe 7 or 8 years in.