Well, i had an ECG a year ago as I wanted to get it checked out because of some medication i was on. Well, it turned out completey normal. But, i am (without knowing why) very paranoid and worried that i am going to have a heart attack or die in my sleep from heart failure. Thing is, i feel something may have developed during the year, is it possible for something serious or life threatening to occur during a year or less? a lot of people have said its not really that possible or very rare, but i need to ask all of your opinions. i am 16 years old, and i am not writing this as a joke, i am just very worried and im not sure why. thank you.