Hello and thanks for the query
You might have Valvular disease of heart as you have murmur and abnormal EKG. This disease may be Congenital but needs treatment at present stage. In my opinion go for Echocardiography
and consult your cardiologist for further investigation. Only ECHO can be helpful whether you needs treatment for Valvular disease or not.
Other possibility for your symptoms may be anxiety
by it doesn't seems to be according to the mail.
Get your investigation done and rule out the cause.