Welcome to HealthcareMagic. Feeling your heartbeat, shortness of breath
etc are symptoms which are related respiratory(chest) , cardiac (heart), or a thyrod/ any other endocrine problem or even a simple stress. If you are obese, then again that might be a reason. But yes, initiate your investigations with an electrocardiogram, echocardiogram
, if required, a holter monitoring to know if there is irregularity of rhythms.Get a thyroid
profile done with your lipid profile
too. In case you are a smoker, even a chronic lung disease
might present with these kind of symptoms.So kindly visit a primary physician, and having heard your history in detail, he would guide you further. Take care.