Last year I had 2 episodes of chest infections - needed 2 courses of antibiotics for the first and another one for the second.
Very unusual for me.
x-ray showed infection in first case but all clear after antibiotics.
Took ages to shift.
Both cases were after Marella cruises with loads of people coughing - fly cruises.
Doctor said there were some very nasty infections going around last year.
Tested negative for C both times.
Hope things improve - best of luck.