Have Postural Orthostatic Tachycardia Syndrome Due To Mild Lupus. Have GERD And Shortness Of Breath. Suggest The Cure?

Question: Hi . I have had many studies done regarding my breathing but first let me give you a brief history. I have Postural Orthostatic Tachycardia Syndrome secondary due to having mild Lupus. I also have both GERD and gastritis. (this is new ever since my lupus diagnosis for SOME odd reason maybe from the extra stress? I do not know I had an endoscopy that showed the gastritis which was negative for H. Pylori . I am a nurse I know I do not know much but I guess im assuming the gastritis is from the lupus as well ; I do not take many NSAIDS or anything of the sort. I have two issues that I cannot seem to resolve that put a damper on my every day life.

I have breathing issues and shortness of breath at times. I had PFT's that were pretty much normal ; it did show some 'small airway disease' but all my numbers were very normal. But I did improve with a bronchodilator. My Pulmonologist did some other test- and said I did not have any inflammitory markers for asthma. Everyone is stating that the breathing issues are coming from my GERD. My gerd is BAD. it was under control for a month and then came back. I have officially been on Omeprazole 40mg daily for a month. And it still has not gone away. I have had EGD's in the past , colonoscopy in the past . I am nego for H. Pylori. and have had a normal HIDA scan. I have changed my diet (but still need to work at it as im not doing well on sticking with it ) I have cut out caffene , alcohol, fatty greasy foods, chocolate, what else can I do. The most bothersome thing is sometimes when i get the shortness of breath. Can this REALLy be due to my gErD like the doctors are saying? Now since I have lupus my rheumatologist did a High Resolution CT of my chest, and chest xrays- both of which came back clean (thank God) so what can I do about this ? its not horrible but I notice it enough to have it bother me.

Also regarding my POTS. sometimes when I have my arms above my head. (aka blowdrying my hair) they get reall fatigue and I have to put them down sometimes. then they get better. The doctors are telling me this is due to blood pooling and my POTS. could that be true? the following tests below are all tests I have had prior to the POTS diagnosis and Lupus diagnosis every test has been normal - but I wanted to list so you know what I have had ruled out
Gastric Emptying test
Colonoscopy
EGD (showed Gastritis)
Hydrogen Breath test
Small bowel series, HIDA scan, CT abdomen and pelvis
CT of my chest, High res CT of chest and chest XRay
EKG's, ECHO, ECHO stress test.
Spinal Tap
TSH, T3, T4 and cortisol levels checked. hemaglobin A1C.
Thyroid biopsy - came back benign nodule
MRI MRA MRV of my brain
as you can see a lot of tests and rule outs I have been positive for POTS with a Tilt Table test and I had some kind of nuclear test that showed low blood volume (despite having normal hemaglobin/hematocrit) I also have low iron.

So- any other advice on this breathing issue? is it from GERD? what can i do to help it go away?
Also advice on my Arms and the fatigue

thank you

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Would the shortness of breath I am feeling at times be due to the low blood pressure, or the gerd or both? if I can fix this I would be so much better. Thank you.