We went to Menorca 3 weeks ago and it was damp at night, Callum started coughing on the 2nd week. We thought it was because it was damp. We came home last monday and 2 days ago he had a large coughing fit, couldn't catch his breathe, eyes watering and lots of clear stuff came up. When to out of hours and they said that his throat, chest and ears were all clear. He is still coughing and we are having to pat his back and walk about with him to clear it. How can he have a cough with a clear chest?