Hello, Welcome to Health Care Magic I can understand your concern. You are a healthy person doing yoga regularly still have symptoms of breathlessness and racing heart. The palpitations occur during sleep also. Since the symptoms started after bad earth quake in Nepal so to some extent they are related to Post Traumatic Stress Disorder though to make diagnosis more detailed history is needed. A lot of individuals suffer from such symptoms after witnessing some life threatening event. As these symptoms might complicate later so I d advise you to consult a Psychiatrist for treatment. Medicines like Beta blockers like Propranolol or Atenolol etc can be used to reduce the palpitations and anxiety. These medicines can be used on SOS basis also. For persistent symptoms regular treatment with SSRIs like Sertraline or Fluoxetine etc can prove helpful. Please consult a psychiatrist for prescription. Continue to do yoga and your symptoms will reduce with time. Thanks, Hope this helps you, Take care Dr Seikhoo Bishnoi Psychiatrist