Hi Jennifer, Yes! Dipping your face in cold water can often break a tachycardia episode — it stimulates the vagus nerve! But it doesn’t help with that all over vasoconstriction that coffee (or Sudafed and other things) can do. We have to be careful, sometimes, with our BP, but it sure helped me for a long time! I agree that your theory is vry basically what happens, but as you said, it’s not QUITE that straight-forward. Working out all of the kinks now, though! We have genetic defects we have to consider, plus a boat-load of chemicals that assault us! And that’s just the beginning! OK, see you soon with my Speedo (that is SO not true!). 😉