Hi my sinuses are very dry, so dry I can't blow my nose so everything drains down my throat. I can't get it up so I cough or gag trying to get it up. when I finally do suceed it like glue thick and brownish looking or sometime greenish. I work in a building that is over 100 yrs. old all that contributes I know. When I take muscinex or something for the drainage it dries it up but then I still gey that throat mucus and its even harder to get up. Is there anything I can take that will stop that mucus build-up?