Hello there,
I agree with the others in that it most definitely points towards being an infection. I had the same just recently whilst I was in hospital, and they gave me antibiotics.
Before that I couldn't breathe and I was coughing up horrid stuff all of the time. The coughing did makes things worse which exacerbated the breathing problems. The antibiotics shifted it all eventually. I do hope you feel better soon.
Take care
goldenwings