Hello and thank you for using HCM.I carefully read your question and I understand your concern. You should not worry, I will try to explain you something and give you my opinion. You should know that your simptoms has to do with a rhythm issue. There are different reasons why you feel fast heart beats, difficulties in breathing deeply, dizziness. It might be just a sinus tachycardia meaning that your heat beats regary over 100 beat for minute. It might be what we call extra beats. This are electrical impulses that generates in part of the heart different from normal sinus rhythm.You feel palpitation, flattering sensation, difficulty in breathing deeply, anxiety. Or it might be a different arythmia like supra ventricular tachycardia, atrial fibrillation ect. The causes of this rhythm issue might be different to simple emotional stress, coffee or alcohol consumption or pathologys like anemia, hyperthyroidism or electrolyte imbalance. But this are sporadic episodes and it might be difficult to catch them. If you I was your treating doctor I will recommend some examination like an electrocardiogram, a cardiac echo to evaluate heart function, a full blood analyze to exclude anemia, hyperthyroidism or electrolyte imbalance and the most important one a holter rhythm monitoring to see your rhythm tendency. Only after this we can better understand what we are dealling whith and and how to menage it. Hope I was helpfull. Best regards, Dr.Ervina.