Juggling sickness and work

How long should a person have bronchitis? I thought it was supposed to be 12 days max. I have been hacking my head off for a month now. I am so sick of having everyone say "Are you still sick?" ARRRGGGHHH! It's not fun sounding like McGruff the crime dog. Apparently I sound so much like I'm on my deathbed that I have complete strangers praying for my health on the phone. That's not good Vern. I have been to see the doc every week for the past month. Two courses of antibiotics, three bottles of cough syrup with Codine, and a decongestant later and I still sound like our fearless crime fighting friend. Any suggestions?