I found a few informative videos on Orthostatic Hypertension and Baroreceptors and how blood pressure and Heart Rate and Autonomic Nervous System work. Some of them are a little tedious, but if you want to understand how blood pressure regulation works, I recommend them. Watch them in order, and because they repeat some of the information, things start to click. I am probably going to have to watch them more than once to retain the information. Brain Fog is a bitch.
After you watch the Orthostatic Hypertension videos, don't forget to watch the POTS videos at the bottom of the blog. You have to scroll down for them.
Blood pressure regulation - Baroreceptors
Part II - Regulation of Blood Pressure (Hormones)
Renin Angiotensin Aldosterone System (RAAS) - Short and sweet
Renin production in the kidneys