Severe chest cold for 10 weeks- how to make it go away?

It hit me like a freight train on October 23 2009. I woke up with a horrible, deep chest cough and wheeze. I'm 32 and a distance runner- I've never smoked. Usually I skip the doctor for colds, but Ive been there 5 times for this cough. Clean x-ray, healthy vitals & labs- neither Tamiflu nor antibiotics did a thing. My doc suggested Xanax (which I refused). Over the last 10 weeks Ive tried just about everything, but I'm still coughing up buckets of phlegm. Any suggestions?