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. You should know that normal heart rate ranges between 50-100 beat for minute.When it exceed 100 beat for minute in norma rhythm and normall conditions we talk about sinus tachycardia. A person might experience sinus tachycardia for different reasons like stress,coffee or energy drink consumption,physical activity or pathologys like anemia,hyperthyroidism, cardiovascular anomalyes. So, to understand if it is just a sporadic episode whith high frequency or something else I would recommend some examination like a cardiac echo to evaluate heart function and valves,a full blood analyze to exclude anemi ,hyperthyroidism and a holter rhythm monitoring to evaluate your heart frequency during day and night. After all this we can better understand what we are dealling whith and how to treat it. Mean wile avoid excessive coffee consumption or energy drinks becouse they rise your frequency. Hope I was helpfull. Bestregards,Dr.Ervina.