when i started, i'd get anxiety attacks if it was too cold, and i still do, but almost never, even in the cold. since i know what's going on, i dont freak out, and stay calm, so that at worst, all i get is tttreremorrrrrsssssss... lol

as for heart attacks, i sincerely doubt that even if your blood pressure DID go up, unless you had heart problems, you wouldnt have any problems at all.