I have a personal friend who had severe POTS to the point she was bedridden. Her PCP told her she would need to go on disability and quit work. She started seeing an MD who is also an acupuncturist. He treats her with acupuncture monthly, and she has had complete symptom resolution. She has continued acupuncture for 4 years now and is still doing great. It sounds like you are doing wonderful for her; perhaps acupuncture could help, too.