Please need help with a nagging cough?

ok, well about 9 days ago, i got a terrible cold..sore throat, fever, the works. ive gotten over it, BUT i have this persistent dry cough that suddenly makes me go into a coughing fit. and i feel i have phlegm too. AND my nose is still runny kinda. its kinda gross, but the mucus that comes up is yellowy. how can i get rid of these?? theyre ruining my life. lol.