Hi, I have had a cough that won't go away. It has been 6 weeks now. First, I was prescribed amoxicillin, as the doc thought I had a sinus infection. That helped the congestion a bit, but the cough didn't go away. Then I was given a zpack which lessened the cough, but I still have the cough. The cough is very light to nonexistent during the day, it really picks up at night. It has been this way the entire time. The cough is quite productive and lots of phlegm is present in my throat. What should I do at this point?