i have baroreflex failure so i have experienced the same thing that you have.
I can always tell where my blood pressure is by the way I feel. I only feel
good when it is normal to high. My pressure can go from 55/33 to 180/100
in just a matter of minutes. The baroreflex is the feedback for keeping blood
pressure stable. Mine was destroyed by radiation treatment for cancer.

When my blood pressure is low I am not getting enough oxygen to my brain
and that is when I feel cognitive impairment. I believe over time this will probably lead to early dementia. I know this is a blood supply issue because when it drops real low I get extreme weakness/fatique and dimmed vision.