Update: OK, I'm back from the doctors. She said my breathing sounds ok (my peak flow was 420), but because of the pains in my chest and upper stomach, and the fatigue I've been suffering with this thing, she's put me on a new (to me) anti-biotic called Clarithromycin.
The prescription is a 2 week dose because of my COPD, and I'll be getting it from the chemists tomorrow. I've been told to stop taking the statins I'm on while I'm taking this to avoid nasty muscle side effects.
Lets hope this works.