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Most likely the symptoms are due to the irregular heart beats. You should have ambulatory EKG so that the EKG can detect the event of shortness of breath.
A regular EKG can't catch the irregular heart beats if you don't have the event. An ambulatory EKG is you wear the EKG machine which monitors your EKG. If you have the event sometimes, it could catch the abnormal EKG while you are wearing the machine. The echocardiography may detect the morphological abnormality of the heart which could cause irregular heart beats.