Doctor Recommendation For Persistent Cough

My LO is currently ten months old, he has been coughing for coming 6 months now. We have tried western, tcm, AGO home remedy. He has had 2 serious episodes of bronchiolitis. I am very worried that his chronic coughing will lead to asthma because it seems like he is having difficulty breathing at times. Anyone has good doctor to recommend to cure persistent cough?