Many of the symptoms (shared between AF and POTS) are caused by "hypoperfusion" in POTS.
What happens if you improve your blood flow? Licorice (and hydration) can help with blood pressure. Maybe hot (not too hot) baths. Maybe exercise. Maybe citrulline/arginine. Maybe ginger/onion/garlic. Maybe massage. "One study suggests that a combination supplement of green tea, astralagus, goji berry extracts, Lactobacillus fermentum, antioxidant ellagic acid, and other vitamins, available OTC, helps increase overall levels of hematopoietic stem cells."
Could it be that a major mechanism by which AF causes its symptoms is via hypoperfusion? Could AF effectively be giving you POTS?