Sometimes i have feeling like shortness of breath . Its come suddenly and go. Its not interfering with my sleep i have sleep 8 hrs. Even i have doing 2 hrs walk daily. No other symptoms. No fever no cough nothing. When i am busy its not come. When eating its not there. Only when i am alone or not doing anything its comes. I check my pulse bp sugar oxigen dr says everything normal. Just prescribed pan 40 and tryptomar tablet. Its come stay 3 to 4 days then feel better then suddnly start after a month or between. I have a acid reflux problem already take a treatment but still sometimes its occure. Please suggest why this happened. Thank you