lasted for a few days. It went away, but turned into congestion and coughing. The congestion and coughing has gone on for 3 weeks now. I'm fine most of the day, but later in the day get tired/run down, and the nasty cough won't go away. It's a deep cough in my chest and I am constantly coughing up phlegm. Should I go see a doc or will it go away on its own?