Hello and thank you for using HCM.I carefully read your question and understand your concern.But you should not worry,its nothing serious. As you describe it might be a rhythm issue. Someone can feel strong heart beats for different reasons. It may be a simple sinus tachycardia as you mention in your prior history.This means that the heart is beating faster than 100 beats for minute. Its normal range in a resting condition is between 60-100 beats for minute. When it goes up you may feel a strong heart beat in your chest and a sensation like your body is beating too.The tachycardia may happen from different reasons from simple emotional stress to other pathologies like anemia,hyperthyroidism ect. A low blood pressure might cause tachycardia. It is well known in cardiology that if we go on hypo tension, our body thought a compensatory mechanism increases our heart rate. But these not in a continues situation but only as a compensatory mechanism. So,if I was your treating doctor I will recommend some examinations like a blood analysis to exclude anemia,the thyroid hormones,an electrocardiogram, echo cardiography and of course a holter monitoring.This will help us to document and see what happens with heart rhythm. At meantime I will recommend you to avoid coffee,caffeine products because they rise your heart frequency. I encourage you to have physical training because sometimes it helps in reducing tachycardia. This is nothing urgent or to worry abut but I will recommend the examinations if the symptoms interfere your normal healthy live. Wish I was helpful.Take good care.Best regards