Thanks for providing more information.
Sorry for late reply and inconvenience.
Firstly heart palpitations can be associated with thyroid dysfunction and Klonopin withdrawal.
Now regarding your EKG,sometimes it is not 100 % accurate to give you proper diagnosis.
Stress related heart palpitation can also alter the EKG results.
Poor R wave progression indicates left ventricle hypertrophy and can be caused due to high blood pressure.
Left atrial enlargement, if you really had it, could be from a stenosis (narrowing) of the mitral heart valve, but a murmur usually is easily heard with that.
And only EKG interpretation couldn't be conculsive.
An EKG does not assess the functioning of your valves. You will need an ultrasound of your heart to get a better picture of not only the size of your heart but also the valves.
Further a physical exam by a Cardiologist and Echocardiography,Cardiac stress test,Angiography also help in determine the exact diagnosis.
So consult your Cardiologist for further evaluation.
Hope this helps.
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