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 your simptoms has to do with rhythm issues. There are some electrical impulses that generates from parts of the heart different from normal sinus rhythm.They cause premature heart contaction that its not a normal one followed by a pause and than a normal heart contraction. This might be an extra sistolic beat or other kind of arythmia like atrial fibrillation, supra ventricular tachycardia ect. It is quite known in cardiology that one way to menage this rhythm issues is whith what we call vagal manovres like inhaling and keeping the breath. They function in a lot of cases. The causes of this rhythm issue might be different like stress, excessive coffee consumption or pathologys like anemia, hyperthyroidism or electrolyte imbalance. This all might happen in a quite healthy heart. If I was your treating doctor I will recommend a holter rhythm monitoring to see what happens with your rhythm and than we can find how to controll it. Hope I was helpful.Wish you good health. Best regards, Dr.Ervina