hi a feeling of heaviness and constriction through out chest can be a stable angina (not heart attack) or it can be because of panic attack also a thorough history is needed like do yopu have family h/o of cardiac ailments how long did the chest heaviness lasted did you ever felt any pain or heaviness in chest on walking which got relieved on resting i would suggest you to go for a ecg test which is a basic test most likely the episode was because of panic but yet we have to rule out cardiac disease if you are a smoker it has to be ruled out at the earliest thanks