please help all night for 2 nights ive b een having constant flutters in my chest then suddenly thorat will go please help all night for 2 nights ive b een having constant flutters in my chest then suddenly thorat will go tight an i feel i lose breathi had a ecg done a weekago also blood test all come back normal ive felt wrong for a few months but not ifeel smotherd like im goin to choke or lose b reath an collapse im 20 years old could this be a heart attack or would of htis shown up in my blood also get mirnor sshoootin pains an feel i have to make my self breath