My Husband Has Been Seeing A Pulmonologist Assistant For A

My husband has been seeing a pulmonologist assistant for a mild case of copd gave him anoro inhaler but he gets attacks every so often where it feels like there is something blocking his airway in his throat to where he cannot breathe right he takes 2 to 4 20 mg tablets of prednisone and then it goes away what seems to be wrong with him this doctor is not finding out what it is would you happen to have an idea?????