I've had cold/ flu symptoms for a week now. Coughing, runny nose, low fever, fatigue. I have taken the normal over the counter drugs and feel better but my lungs are still coughing up clear mucus. A pain developed in my back on the right side only when I cough, then It included the left side and now seems to be including my front left abdomen. I am a 64 year old male and have COPD. I don't normally see a doctor with cold symptoms but the pain only when I cough has me concerned. Any Ideas would be appreciated.