My son is 6.5 year's old and having Asthma since 2 years. we were giving him seroflo inhaler (1 puff 2 times) since then. however since 2 months his bouts of cough are not being controlled by seroflo so another doctor has suggested aerocort inhaler (2 puffs 3 times). this isn't helping too and the coughing has become so intense that he is unable to sleep at night and leads to severe headache. please suggest what can be done