Hello dear , hi
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I have evaluated your query thoroughly .
*  There are different  reasons for the same 
    -  decreased lung compliance  -  
stress , 
anxiety related  -  minor 
        infection  issue  -  low 
hemoglobin or hydration issues  -  others .
*  Recommendations  for  better  outcome
-  Deep breathing  exercises , walking in fresh air , YOGA
-  Avoid 
smoking ( active / passive )
-  Avoid exposure to dust / pollens  , if required  use  triple  layer  face 
    mask .
-  Maintain hydration with plenty of liquids .
-  Balanced nutritious diet .
*  Later on if  required  consult your doctor for basic work up with some 
    lab  tests  and  x-ray  chest with or without pulmonary  function  test .
Hope this will help you for sure .
Regards .