I think I have an lower-respiratory infection. Anything I can do to feel better before going to the doctor?

I'm coughing up green/yellow phlegm, but other than the cough and stuff coming up (and sore throat due to all of the coughing) I have no other symptoms. Expectorants don't work (again, it's a lower infection) and I'm not using cough drops (I know this stuff needs to come up). I am, however, using throat drops. If it's not gone by Friday I'm going to a doctor. Until then, is there anything else I can do to feel better during work (I'm a teacher)?