Cold and flu lasting more than two weeks

Patient: I have been sick going on two weeks. It started out as a cold, runny nose, congestion (bad) in the lungs. The congestion in the lungs was my primary concern. It really hasnt gotten much better, but the noise and coughing is better. I feel hot and cold at times. I have had plenty of bed rest and have been drinking alot of fluids. I am taking Walgreens severe cold tablets every 4 hours and taking Nighttime D to help sleep. My most recent problems include pain in my sides from coughing,, just under the ribcage, both sides. But the scarest thing is the shortness of breath. Please help.