I have been having chest discomfort for two months, I saw my dr. he did an ekg and it was abnormal (PVC's) I had an echo stress test today and my dr. says all looks normal. He sent me home with a holter for a month and beta blockers. My resting heartrate is between 80 and 100, and in the first three minutes of stress test , hr was 160. Family hist. is father as well as 12 of his male siblings all have has massive heart attacks without any positive stress test warnings....I am a 40 year old wowan no drinker, non smoker. Should I be concerned?