"Anyways, about a month ago, I got up to 75mg of Iodoral and within a day of that, had a major flare up of heart palpitations and the Mitral Valve prolapse/dysautonomia symptoms got horrible. I could not sleep, and nearly went to the emergency room because at times the heart pounding became so severe, I thought I might pass out. It eventually calmed down "
My guess on that one would be that the Iodine had freed a large amount of heavy metals or other ions in your body via the bloodstream, and when it got to the heart muscle it exhibited the effects you mentioned.
When I did the Iodine thing, I always made sure I was drinking tons of water.