Hello ..see as you have such strong history of cardic illness in your family , we cannot just say it is a psychiatric illness...you should get your self evaluated for any cardiac disease as well as for thyroid
abnormality...if your evaluation by physian does not reveal any abnormality than you can consider it psychological, as you have mentioned you have lot of stress
and your symptoms match the profile of panic attack
.....for this you will be advice various intervention by your psychiatrist
and you can get over this problem easily...