I have been getting cranial sacral therapy for several years now. Not for POTS, but for other health issues.
I took me 3 treatments before I really started to notice the change in my overall health. I no longer require chiropractic care (used to go 2 x per month for over 20 years) and I find that my immune system is much healthier. Better sleep, more energy - overall I would recommend this treatment :)