I'm 19 years old and have been experiencing rapid heart beats for the past year now. They seem to occur roughly about once a month, and they last anywhere from 5-25 minutes. The reason for my concern is that these rapid heart beats cause extreme dizzyness and of course chest pain. However, the strangest part is that once they start, these beats are so intense that they seem to shake my entire body until finally they are over. I'm also unable to walk properly while this is going on. I have seen my family doctor about this issue numerous times, and the only test they have run was an EKG which turned up completely normal. This is a serious concern of mine, and it scares me everytime it happens. I want to know if I should be calling an ambulance the next time this occurs, or if I should perhaps see another doctor?