Aside from herbals, re chest congestion, also a vote here for Robitussin (Guiafenesin)

However, do not take anything containing a cough suppressant eg. DM (dextra-methorphine?) A doctor friend from the US told us that the availability of that ingredient, in over the counter medicines, has been one of the biggest boons to the American Medical Industry in the past ten years or so. He said there was a correlation between the increase in cases of pneumonia and its use. You need to cough the crap up, not have it festering in your lungs.