Hello and thank you for using HCM. I carefully read your question and I understand your concern. I will try to explain you something and give you my opinion. This kind of pains that you explain might be generated from heart. The first think to take in consideration is ischemic heart disease.This means possible problems with heart coronary arteries. Ischemic pains have some characteristics. They in general are retro-sternal pains like heaviness, tightness. They irradiate to one or both arms, to the neck, jaw or between shoulders. They last from 5 to 30 minutes. Usually they begin during efforts. Other heart problem that might give pains like these are aortic problems. They might give pains between shoulders like you explain. So, if i was your treating doctor i would recommend you to seek medical attention. Your hereditary history all sow makes this mandatory. Of course this might be nothing but it is better to make a simple chek up with an electrocardiogram, an echo-cardiograph, a blood analyses. After these your doctor will decide what to do next. Hope I was helpful. Best regards