About 6 weeks ago I got a cold that came with a cough, after a week the cold cleared but the coughing did not, symptoms where random coughing attacks and extreme difficult breathing when have coughing attacks, followed with flem. When I was to breath deeply you can clear hear flem either in my throat or chest. After 1 month I went away and finally got over the cough, but during the end of my trip I was out in the cold, and the cough has came worst and more frequent during the day. What could this be?