Hi I am suffering from cough so many days my doctor took a test on me i.e pefr test the rating is 250 all the 3 times instead of 414 according to my height and weight Dr. suggested me a igm blood test immunoglobulin serum that is 21.90.I m taking a medicine named Montek LC .but when I am not taking that medicine my cough fits are increased terribly what should I do.