Interpreting Abnormal EKG

[mycompass]

I have been having chest pain lately.  3 months ago, I had an echocardiogram and a stress test and many EKGs.  The only thing my doctor found was a very minor-trivial case of mitral regurgitation and state it was nothing to be concerned about.  I had an EKG today, and it was abnormal, my doctor(non cardiologist) didn't seem to be concerned.  I am uploading my EKG for your interpretation and reference.  It reads: Possible Left Atrial Enlargement (What does this mean?), Possible Right Ventricular Conduction Delay (Any concerns?), and Moderate ST Depression (Any concerns?). These chest pains I get are sometimes on the left side below my breast, and I also feel my heart beating in my upper right shoulder blade.  The past three weeks my heartbeat has been much higher while resting and sleeping and is sometimes between 92-100 when it used to always be 60 or 70.  Please let me know if I should be concerned at all.  

Sinus Rythm 77
PR int: 128 ms
QRS dur: 87 ms
QT/QTc 370/401 ms
P-R-T axes 77 77 48


Thank you