Bronchitis

So my LO is 10 month old she has been diagnosed with bronchitis since birth her chest has always been chesty you could hear it from the other side of the room Aneways I been hospital twice and doctors one too many times they won't do anything to help and said will go away on its own it still hasn't I'm so fed up I even started going crazy at the doctor after the 5th time and they still didn't help anyone have any advice for me