My son is 8 years now. He has been having cough in the evening for about 2 weeks now. We have been asked to give montair in the evening. When we administer it, the cough gets controlled. If we leave it for even one day, he gets coughing continously till mid night. We want to understand what may be his problem. He complains, there's something in his throat which gives him discomfort. Yesterday, I gave him strepsils., and he was feeling much better. Kindly advice if we need to have him diagnosed.