For the past 20 years "needing to lie flat" has been my mantra
I've been taking high blood pressure medication for many years. Recently I discovered that without blood pressure medication I'm 120/80 most of the time lying down, but 150/100 pretty much all the time I'm upright.
I've said for years that orthostatic hyper(!)tension is not easily diagnosed. It fits with fainting and tachycardia responses. I also note it is a cerebral perfusion technique. Most doctors take blood pressure when a patient is in the office sitting (after a long wait/trek) to the doctors office. Even when a cardiologist looks for orthostatic issues, they are often looking at the shift from sitting to standing.
Also, only the end result is measured, ie, the blood pressure. Often the levels of aldosterone on renin are not measured. My renin levels have been measured multiple times at 10x the normal upper limit. Kidney stones ruled out, doctorly shrug. I point out that if the renin levels are pinned high, but aldosterone is normal, then it is likely the signal is being ignored and the body is compensating using backup systems.
My greatest successes with supplements and the ones that I continue to use, have been ones that reduce blood pressure. My current regime of lowering blood pressure and being careful about glucose spikes has given me a huge amount of energy, both physically and mentally.