Hi well come to HCM.
It seems you have palpitation
which can be benign due to Anxiety
, after exercise,fear.
etc.Excess tobaco or smokig can also cause palpitation.Other conditions like cardiac
also ca give rise to palpitations. You have doe your ECG which is normal,
but when there is intermittant arrhythmia,a single ecg can miss it.Better diagnostic
tool is Holters monitoring which will give 24 hrs record of your heart beats during your
normal activity.So take drug like Alprazolam to get rid of anxiety for few days and if
not relieved of symptoms get done Holters monitoring to finalis the things and if nothing specialised recorded in that leave the tension. thanks