Adrenal Basis For Pots?

[sideofsalt]

Pre-dx a couple of years ago, some of my biggest POTS episodes coincided with the onset of seasonal allergies. I eventually developed hives as a response to environmental allergies and foods. Since adrenaline clears excess histamine, and adrenaline is what makes blood vessels constrict (without it leads to hypotension in POTS), then why aren't my specialists addressing the adrenals directly? I’m curious about adrenals and their role in POTS, and separately, Addison’s. It may not be that simple or direct, but I though I should ask in case you have experience exploring any paths of treatment related to this. I may have done some initial testing at the time of my dx but I only recall ruling out pheochromacytoma.