Phlegm buildup, chills, migraine - whats going on?

OK so this is the last week before finals at my university and I have had a sickness thats been keeping me unproductive... I started writing a term paper last Monday (1st) in which I had to research a lot of old books. Ever since that day, mold or mildew from the books has given me a cough, cold, etc. I turned in the paper on the 4th but have been sick since then... Up to yesterday it was just constant phlegm congestion that I had to cough out, and an even more annoying runny nose. Last night I had to leave the library because I had the chills and a migraine in addition to the other symptoms. Now both of those are gone and its back to the cough and runny nose... What should I do? - I've already tried Mucinex, Dayquil, Excedrin, and Sudaffed. Help please...