Well, generally, a diagnosis of P.O.T.S. is supposed to be made on two criteria (though I had an electrophysiologist base my diagnosis on the tilt table test results alone)- a heart rate that increases by more than 30 beats a minute between lying down and standing up (you should give at least a minute of standing to start with before taking your pulse to allow your body to normalize if it is going to).... a positive tilt table test for P.O.T.S., and a standing plasma norepinephrine level of greater than 600, if I recall correctly. With the tilt table test, I think they can also check for NCS (neuro-cardiogenic syncope)
When you have all the symptoms you do, it is best to try to look at other potential causes of them before pursuing in ernest whether or not you might have dysautonomia.
The heart rate increases to prevent passing out, though in some with P.O.T.S., the body does not succeed. In others, like myself, I've found my body can overcompensate and my blood pressure will actually spike with standing.
Some of the things you describe makes me think in your work-up they should be:
A) doing an heart work-up, including an echocardiogram to try and rule out CHF (congestive heart failure)... with your leg swelling, shortness of breath, fatigue, etc. and a doppler of your carotids with your brain fog, etc. and ask for a holtor monitor & get a fasting lipid blood panel to check your cholesterol and triglycerides level.
B) testing your thyroid function (see private message),
C) your female hormonal levels... with night sweats, nausea and tachy, etc.,
D) an HgA1c and blood sugar level... with fatigue and nausea, weakness, rapid heart rate- check to see what your blood sugar's doing
E) ferritin and iron, T.I.B.C. (total iron binding capacity) and iron saturation percentage (see private message for symptoms of iron deficiency)
F) kidney function testing (weakness, swelling, shortness of breath, red blood cell count reduction w/anemia) Also a CBC (complete blood count)
G) blood potassium level- with weakness
H) B 12 level- with fatigue, shortness of breath with minimal exertion, nausea;
I) also get checked in general for a vitamin B and/or magnesium deficiency with the restless leg problem as well as ask about dopamine testing with restless legs
J) Neurologist work-up with passing out, brain fog, trouble finding right words, weakness
K) orthostatic blood pressure and pulse testing
Hi! Well you certainly have many symptoms of dysautonomia, with POTS being one of those conditions. First, I think you need to determine if it's your blood pressure or heart rate, or combination of both that could be causing your symptoms. For your HR to be a symptom of POTS, it must increase 30+ beats within 10 minutes of changing positions. That's the "P" in POTS. So if your HR changes 30+ beats from lying to sitting, or sitting to standing, you have the hallmark symptom of POTS. While you are sorting this out, be sure to drink lots of fluids, preferably with electrolytes-but not sugar- and try to stay as active as you can. Like walking if you can, or using a recumbent bike if you can't safely stand. You have to try to push activity. It's hard to do when you feel so sick, but it helps! Let us know how you are doing.