I went to Dr. on monday after having a bad headache for over a week. She diagnosed me with a sphenoid sinus infection. I started on Biaxin Monday, and today is Friday. Since that time, the headache has been giving me sharp stabbing pain on the right side of my head almost at the top like 2 or 3 inches above the temple. I've also developed a swollen eyelid on the right. How long should it take to feel better? Should I call the Dr. back? Does it sound like a sinus infection, or something else?