Anyone have POTS? Cyclone hitting tomorrow, heavy barometric pressure drop, scared.

A cyclone is hitting the PNW tomorrow and the barometric pressure is going to drop from 29.90 to 29.50. There was a thunderstorm awhile ago where the barometric pressure dropped slightly from it when I lived in las vegas and it gave me the worst flare up I've ever had. I'm scared. What's your experience with these and how are you preparing?