I got the hypotension workup a few yrs ago after passing out while checking out a grout line with a tile guy. Ive fainted 4-5 times in my life and get head rushes all the time. Especially on days i exercise hard. BP is lower for 24 hrs after exercIse.
There's meds you can take, but that's after you've figured out the whys (dehydration, electrolyte imbalance, medication, heart condition, random), and if it is really bothersome or dangerously frequent. I was lucky my primary care Dr did an easy lie down and the stand BP test that showed the big drop in BP, and right away drew blood. It proved yes postural hypotension and no dehydration/electrolyte thIng. But because I had passed out, he still had me go to a cardiologist. All that testing was basically normally abnormal (long story).
Im not taking meds for it. I'm supposed to clench my rear end and thighs when I stand to keep the blood in my upper body.