Talk to General Physician on Left Arm Pain

I am feeling upper left arm and shoulder pain from last week. sometime its present sometime not. no chest pain. last night it was severe i could hardly lay down. i checked bp it was low 60/100... then the pain suddenly disappeared at night...today morning i felt it again in shoulder. it is mostly in 3 places, uper left arm or on shoulder, or back shoulder blade. i have done 3 ecgs in the past 4 months all normal, no cholestrol, no bp, no family history of heart issues, no diabetics. but i still always afraid of heart issues. kindly guide me...thanx