Suggest Treatment For Fever And Muscle Pain

I've had the flu for almost two weeks, starting with muslce aches, fatigue and a dry throat. My doctor gave me antibiotics. It seemed to get better for a day or so but then came back with sudden pain in my upper left back, radiating to the front. It hurts when i breathe deeply or lie down. I have a slight fever, and the occassional cough which is very painful and brings up some phlegm. I can't get to see my doctor for several days. Is this an emergency? Thanks.