mi had an sinus infection in November took two rounds Zithromax seemed better second week December came down with throat type infectionn lost my voice horrible sore.throat another zpack. Now my neck is stiff in back and glands hurts down back of neck. Headaches extreme fatigue joints painful. Doctor ran blood work thyroid fine mono negative white blood cells fine red a little low. I am 45 in great shape exercise work go to school etc. I no something is not right any suggestions?