I have had a cold/running noise, chest phlegm and headache I am going on 3 weeks, it is getting better, last week it was green phlegm, this week it is very light yellow, but I still have a cough and mild headache and no energy. I have purchased over the counter Mucinex and cough medication. Drinking lots of water, and resting as much as I can. I am still working full time job, when I get home it is rest, rest, rest. Should I be concerned that I am going on week 3? I am basically a healthy person, only going to the doctor for annual check ups, so for this cold I figured it would run its course - I eat healthy, am a non smoker, and exercise.