hi rachna, the medicine given by your GP should take care of your common cough and cold
, you may be allergic to something, may be some food article or soap or shampoo or any part of clothing, just check whether you have been using any new product or any thing different then what you are used to. Another thing is that you may be suffering from some worm infestation which does present sometime as dry cough
. You may get yoursef dewormed as it is not harmful and it may solve your problem. In the meanwhile you may use some cough drops or lozenges to take care of the dry cough.