I totally understand your concern and frustration. I too have a strong family history of heart disease. My father passed away at 51 with heart disease and had a long line of it in his family. My mother just had open heart surgery in March due to six blockages. My cardiologist did the ekg's, stress test, etc.. Those all came back normal. But I knew something had changed within my body, so I demanded they do a cardio cat scan. They then found a blockage of what appeared to them about 40 to 50%. With all the symptoms I was experiencing, I then asked them to do a heart cath, where they then determined my 40 to 50% blockage was 75%.
If you are experiencing back, jaw or arm pain at all, I would make them do a cardiac cat scan on you for starters. If your cardiologist isn't hearing you, then find another one that will. I am on my third cardiologist because of the fact they want to down play any symptoms I am having because of my age.