Hi pkq. I worry about the pain extending down your left arm. That definately requires the attention of a doctor, especially in the light of familial heart disease. I'm a diagnostic radiographer who used to work in CVIU (cardiovascular investigation unit). I did cardiac angiograms, stents etc & pain down the left arm is common with partial occlusion of a vessel. I'm NOT a doctor, but would advise you to see one soon. Look after yourself. Regards, Yasmin.