I'm coughing up a thick yellow mucus .and when I have my head down for a certain amount of time ,I get this clear drainage with a stinky pus like smell. And.when I blow my nose its this yellow and thick. Mucus thats hard to get out. And I also have this bad taste after I cough up the yellow thick like smelly mucus discharged and it won't go away. Even if I brush my teeth all day and use mouth.wash