Suggest Treatment For Fever, Chills And Head Congestion

My illness started with fever , chills and head congestion. After approximately 2 weeks and not feeling any better I consulted a local Dr. who gave me a shot, a Zpac, and cough medicine. It seemed to do nothing and in fact a few days later I was worse than ever. I felt extremely tired , achy, and fluid in my lungs to the point I could hardly sleep for several nights due to the rattling. I now feel much better but still after 5 weeks have a cough and still have fluid in my lungs and a tight chest and shortness of breath at night.