I am a 49 year old female, with a high stress job and have been working very long hours the past 4 months, nearly 7 days a week. I’m generally healthy but have drop approx 15 lbs in the past month and have experienced a burning in my back which I can easily relate to long hours, stress and lack of rest but the past few weeks, on three occasions have had pain in my left upper arm/shoulder area... should I be worried about a heart issue?