Coughs and Wheezes

I've had a touch of flu for several days, probably exacerbated by standing around in the cold on London Bridge station platforms last Monday. It's been making it difficult to get any sleep, since for some reason I start coughing whenever I lie down and try to relax. When it gets bad, the cough seems to go through my vocal chords so that it makes a mad laughing noise rather than a wheeze. I tried a packet of lemsip but it didn't seem to do any good. A mint toffee is effective for a while. Fortunately it now seems to be clearing up. I must get back to taking more regular exercise, haven't been swimming so far this year.