I have phelgm and contantly swallow it when trying to clear.I went to doct last week and he prescribed Omnicef antibacteria pills but it did not clear .Its mucous constantly coming up at my throat .I can say it has been COUPLE OF months now.I live in sand dusty area .Could this be pneUmonia or TB?THE PHELGM IS CLEAR WHITE when spit .What should I do as this is extremly uncomfortable.I do not feel sick any other way except for the mucous at the back of my throat.