You say you have a viral cold. How do you know? Did the doctor take a culture?
You must need go back special doctor for your cold and fever. You xray chest and also do a lung function test to check for asthmatic problems.
Best of luck!
Have you considered that you may have pneumonia? Please see your doctor and ask about this and get treatment you need. Blessings - Blu
You need to go back to your doctor. He may prescribe a different course of antibiotics if your chest is still congested.
He may even send you for a chest xray and also do a lung function test to check for asthmatic problems. As you have had it for so long, the doctor may even take a sample of your coughed up phlegm to test for any bacterial or viral infection.
Make sure you drink plenty of warm drinks, avoid milk products as this encourages the formation of mucus. Keep warm and away from draughts.
Best wishes