Dry and Cropping cough, . His lungs.

My son frequently gets the dry ,cropping cough, and continously coughs . he has undergone the bronchiscopy 1.6 years back when he was 2.5 years old. he chewed a oats crunchy and coughed for 1month frequently antibiotics alsonothelped. With doctors suggestion we underwent bronchio scopy procedure. to find if some foreingn material would have gone into his lungs. Fortunately there was nothing in his lungs as per Manipal hospitals specialist dr pulmonologist after the bronchiscopy procedure. He frequently gets the dry cough and cropping cough. and coughs continously. Every time he gets this dry cough we approach the doctors they say his upper airway got infection and his chest is very clear. After Nubulization with adrenaline and budecort , syrup Allegra, & Omnicortil forte for 5 days the cough calms down. But otherwise the way he coughs sounds very dangerous and continuous coughing which is worrying us a lot. So we are thinking to try out homeopathy medicines if it can solve this issue.