I was sick with sinus nifection 3 weeks ago. The Dr. gave me a course of antibiotics for 10 days. 2 days after finished those, the pain in the throat came back, as well as the cough. A week after that, I start getting a headache and fever after 6pm every night. During the day is fine, but at every night it's the same thing. I went back to Dr and he gave me a different course of antibiotics, a 5 day course this time. I took the last one today, but last night was just the same as always. I always have to have the advil handy. This is a mystery to me, especially the fact that it comes every night at the same time. Ideas?