Welcome to HCM
After going through your history,it seems that you suffered a chest infection
Viral and/or Bacterial and you have bronchitis
and a hypersesitive airways with asthamaic response.
Oral steroids are very useful in such cases and once problem is controlled this must be tapered and do not stop suddenly.
As chest tightness
is there take bronchodialators inhalers at regular intervals.
Keep yourself well hydrated and even take steam inhalation twice daily.
If you are not asthamatic everything will improve in few days but in few cases hypersensitivity
may persist ?
Best of luck to you