Severe cough congestion and fever.

My son Shaurya was suffer from from chronic cough congestion from few days such that there coughing is not stop and child feeling difficulty with cough and fever. When the fever raised the cough is stop and as the fever drop again child start coughing.The last Dr recommended codistar and asthalin for instant relief.The child was OK around for few days 8 something and after that it again get cough congestion and but now slight less coughing.The some Dr suggest that child of 1 to 6 not get bronchitis , but one Dr gives asthalin, levolin and some suggest ambrodil ,bresol along with levocetrizine and montair. I really confused that some suggest bronchitis while some suggest allergy and some told that it is inherited from family but myself and my wife had not such problem but my mother had problem of short of breathing usually seasonal change.Please suggest me the right option to follow for my children treatment.As it is only 4 years but while seeing coughing and upset I really feel guilty