Heart flutter high heart rate no other symptoms is this a fib er dr told me tests came back fine if it was a fib wouldn't she of told me

It may be: A lot of cardiac arrhythmias are intermittent, what we call in the world of medicine, paroxysmal. Unless there is a heart monitor on you while you are having the symptoms, one can not judge what they are. Your ekg if done while you are feeling ok, is mostly worthless. Have your doctor place a 24 hour holter monitor for you, if that is fruitless, go to a 30 day monitor; you will have an answer.