MY CHild is 5 yrs old and having chest congestion since 22april and had a breathing problem at that time . His AEC report and xray reports are normal. but in the night if we increase the speed of the fan he starts coughing in short intervals continously. and his breathing rates increase a little bit as if difficilty in breathing. When i switch on the steamer with vicks in it within 5-10 mint. he is normal and sleeps without coughing. what is the problem he is having? how he can be cured of heavy chest congestion. he has taken maclav-bid and tedycof also.