It went on long enough that I got concerned and went to see my doctor about it. She explained that sometimes at the end of a cold, you can get into a cycle - you cough, which irritates your throat, and in turn, your irritated throat causes you to cough, and on and on. There's also an involuntary "cough reflex" that gets triggered and is very hard to resist.

She said that in order to break the cycle and suppress the cough reflex, I should start to take Delsym cough syrup. I've never given much credit to cough syrups, but I have to say, it did the trick. I still felt myself wanting to cough, but I was able to relax and ignore it and let the urge pass (which I hadn't been able to do before the Delsym) and within just about 2-3 days, I wasn't coughing any more.

Anyway, just wanted to pass that along in case you're dealing with something similar. Delsym. It's good stuff.