Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. Your doctor is right, if he had all the information about you, like pathological tests and other case reports. Stress can cause breathlessness. Stress can cause anxiety. Youare feeling anxious about your health. After the episodes of shortness of breath, you started monitoring your heart beat and other shortness of breath symptoms. Means you became obsessed with it. Such an obsession created anxiety in you. Even though there is no actual symptom of breathlessness or palpitation in you, when you just observe it, the symptom start and start worrying you. The best course of action is to ignore the symptoms and do your normal activities. In due course, the obsession and thereby the symptoms shall vanish. If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.