i certainly do not know enough about you or your case to pronounce you "well" and free of all cardiac disease. if you are worried about the status of your heart see a cardiologist and have an ecg taken on a treadmill. if the cardiologist pronounces you heart-healthy then you can be assured that all is well.
i am a generally healthy 27 year old who has had multiple normal ecg's. am i fine? . i suffer anxiety attacks and am a hyperchondriac. during the height if panic attacks i have gone into hospital for ecg. all have come back fine and normal. i also was able to organise a chest xray and blood tests. all normal. should i feel assured that my heart is fine and stop worrying about it or is there other tests i should really do to be sure?