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. Paroxysmal supra ventricular tachycardia has to do with a rhythm issue.It is an electrical impuls that generates from a part of the heart different from normal sinus rhythm.It causes this fast beats and you might experience palpitation, strong beating, difficulties in breathing deeply and anxiety. There are some factors that might couse arythmia in general. Sometimes they are idiopathic, without an identified cause, it is just a patology of electric system of the heart and the only solution is to takemedication to controll them. As you already know there are some factors that might exacerbate the simptoms like strees, coffee or energy drink consumption.It is mandatory to avoid them.You say that what you are drinking does not contain such thinks but you have to be shure.Sometimes just presence of calcium might rise the heart contractility and cause the arythmia. So if your simptoms are related to the drik you are taking my opinion is to stop it. There are other patologyes like anemia, hyperthyroidism or ischemic heart disease that might be responsible of arythmia. So, if I was your treating doctor I will recommend some examination like an electrocardiogram , a cardiac echo to evaluate heart function and walls, a full blood analyze to exclude anemia , hyperthyroidism and after that if the symtoms persist my opinion is to arrenge or start an anti- arythmic agent to controll the episodes of PSV. Hope I was helpfull.Best regards.