IN A NUTSHELL: I’m looking for NATURAL remedies for the blood volume increase at this point, thanks!

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I have POTS (postural orthostatic tachycardia syndrome). I can’t stand I get dizzy and black out due to blood pooling in my legs. I have extreme low blood pressure and I’m seeking natural remedies because I also have severe MCS (Multiple Chemical Sensitivities, can’t take drugs, the chemicals in them trigger a reaction and if my BP gets any lower I could die. I’ve already passed out, been in a coma etc…)

I also have severe hypoadrenalism (adrenal failure), hypo-cortisol & hypo-aldosterone. HYPO = TOO LOW!

Recently I heard the term "hypovolemia" and that I don’t have enough blood volume. Why is that?

I drink a lot of water. Not too much so I don’t drown but really a lot.

My face gets very bloated at times. It was fine last night then it became bloated in a moment.

Is there any relation to eating vegetables and fruit and this condition? any help greatly appreciated.
Thanks.
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NOTE: I HAVE GONE TO 6 DOCTORS AND THEY ARE ALL CLUELESS HENCE MY POSTING HERE. DRs. DISMISS ME BECAUSE THEY THINK HYPOTENSION IS NOT SEVERE YET IT’S A MATTER OF LIFE OR DEATH AT THIS POINT FOR ME. End of my rope. Need help. Thanks.

For example if you borrowed a few from a friend to keep your blood pressure down to pass a physical which is required for a job I recently applied for until I can see a doctor to get my own. I know it’s not a good or ethical thing to do but I really have no choice at this point.
Thanks for your replies