Apologies if I ask for the obvious, and you probably already thought of that, but are they following your menstrual cycle?

I just happened to see a documentary on women who had horrible hormone swings that went way beyond "just being a bit grumpy". Food seemed to play a big part, and they normally found out after an elimination diet. Your condition might get worse in the same way (I'm not saying they are causing it).

That said, your symptoms sound worrying to me, and I hope you have someone around who can keep an eye/call a doc when things go bad. I'm not a doctor, but problems with your heartbeat and other symptoms make me think about toxins before they make me think of "just" autonomic PN.

Other question: are you hyperventilating?