Yeah my heart actually flutters and sometimes i suddenly have to burp a lot. Also sometimes I feel this sharp squeezing in my brain and I usually have a real bad headache after that
I'm sure you know more than me, and I'm just a curious amateur scientist but it sounds like all the things the autonomic nervous system regulates? In POTS it's all about this spike of cortisol from a momentary blood pressure drop caused by a hiccup in the autonomic nervous system.
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Deep breaths and the like (yoga for you) help