Hello and thank you for using HCM. I carefully read you question and I understand your concern.I will try to explain you something. There are different reasons that might cause increased heart beats. As you have mention physical or emotional stress, caffeine products might cause increased heart frequency so its mandatory to avoid them. All sow, there are different pathologyes like anemia, thyroid gland problems like hyperthyroidism that might be the cause of fast heart beats. When you experience a high frequency, it might be normal to experience palpitation or a chest discomfort. If these frequencies are interfering in your normal daily live, If I was your treating doctor I will recommend some simple examinations. I will recommend an electrocardiogram, a cardiac echocardiography and of course a rhythm holter monitoring for 24 h. This is necessary to have a full view of your mean frequencies during day and night. After these, a full blood chek up to exclude anemia or thyroid problems. Doing this examinations helps us understand if it is necessary to treat this high frequencies or not. Hope I was helpful. Wish you good health. Best regards.