Some people have all the symptoms of a heart attack, some have very few, and some have none at all. If you feel as though you are having one you call an ambulance, never drive or have someone drive you either. Then chew up 4 baby aspirin. Medics have life saving drugs and equipment, and also EKG in their ambulance. Plus, they alert the ER if you are truly having an MI, so the room is ready when you get there, also if you're having a STEMI, the cardiac cath lab will be ready and waiting for you to open up your blocked artery when you get there. Temporary arrhythmias are perfectly normal, almost everyone has them. A lot of people go into short runs of Afib and come right back out of it. On the other hand, if you're symptomatic( short of breath, chest pain, etc) you need to get checked out.