My baby was just diagnosed with reactive airway disease (suspected asthma)

I need any tips/tricks you have for a child with asthma. Portable nebulizer reccs? Air purifier reccs? She is 5 months old and has had a cough since birth. I have brought her to the pediatrician literally 8 times (I counted) for this or where her cough was mentioned and they never did anything. She has had retractions some of these times and I mention it everytime and they called it the "daycare cough" or say it is viral illness or could be due to reflux. Now I saw another doctor who FINALLY took an xray and says she has a serious condition and it has led to pneumonia!! She is on two inhalers and an antibiotic. I feel so awful its gone on this long. Is this common? I knew the entire time she wasn't always breathing right and I feel so gaslit by the doctors. I want to do everything possible to make her life easier.