I thought I had the flu, my dr. was overloaded with other patients with the same condition. I went to Urgent Care. They said I have a severe sinus infection. I have had 4 sinus surgeries, and many sinus infections in my life. (I m 70 yo). My question is this: how can this be a sinus infection when all the thick green secretions are going down my throat. My nose is not involved. It s clear. I m extremely weak, nauseated from the stuff going down into my stomach, no appetite. I had chills, and a low grade fever 99.1, but it left a few days ago. I have been coughing up the green stuff. The dr. gave me a Z-pak and I am slowly getting better. Is it a sinus infection?