I have been coughing up yellow sputum for about a week now. I am also blowing large amounts of thick yellow mucus out of my nose. It has gotten to the point where when I cough, the sputum is so thick that it causes me to gag and throw up. I also sometimes have shortness of breath, but this usually goes away on its own. I have not had a fever at all, only some body aches and fatigue from the coughing. Is this something I should be seeing a doctor about soon?