I've had a sinus infection for over a month. I've been on 2 different antibiotics and it's still there. There is no drainage from my nose, just behind my nose and in the back of my throat. The smell and taste of infection is AWFUL and is making me sick to my stomach. I feel feverish as well. The color of my phlem is bright yellow/tint of green and some has a brownish color to it. I cannot see the ENT until the 14th of Sept. Should I go to the ER?