Ive been congested for about 3 weeks now, its clear sometimes yellow, and its all day long and nite, at first i thought maybe i developed allgergies so i went and took claritin, then it didnt work so i tried advil cold and sinus, that didnt work so i went to the clinic and the doctor said it was a sinus infection, so he gave me cefrozil, that didnt work and now im on azithromycin the 2nd day takin this, just wondering if the doctor knows what i really have or is just assuming.