My last "episode" was about a month ago. My HR went up to 220 (as it's done when hospitalized). I knew when it was coming on and immediately asked my daughter for help. I practiced breathing, laid on my back with my legs up, splashed my face with cold water, did the bearing down technique, and took my Flecanide. None of which helped immediately. My daughter read something on-line about the cold water and the diving reflex (or whatever it's called) and filled a bowl with lots of ice and cold water. You're supposed to take 3 deep breaths and then on the 3rd one, hold your breath, and dunk your head in the cold water. Hold under water for as long as you can and then come up for air. My HR dropped from 200 (at this point) to 90 in a matter of about 45 seconds. It was pretty amazing and a huge relief.