I come bearing pixie dust as well

and a big
I agree with many of the suggestions above.. sleep is a big one.. it may be hard since you're just adjusting to your new surrounding.. but even just relaxing and watching a movie with your new buddies as opposed to running around helps.
Vitamin C boosts your immune system, so maybe get some vitamin C drops and take some... if you know met any singers on your campus they're most likely to have some - come fall/winter a few vitamin C lozenges a day feels essential for a vocalist.. Or just up your intake of other things that contain vitamin C(take an extra orange from the dining hall, drink a cup of orange juice, etc..)
Zinc lozenges also may help.. sometimes you have to experiment with the flavors you like, but I found they make me feel better.
Water, water, water! It helps flush things through your system.. and if you feel like your throat is swollen then cold water is 100 times better than tea at the moment.. things like tea and hot soup soothe it, cold water on a swollen throat is kind of like icing a swollen ankle.
Do you take a daily multivitamin? It's amazing the difference I feel when I do and when I forget to for a period of time.
That's all I can think of for now.. I audition/perform a lot in the winter so I have to be ready to fight a cold at any time - so these are just things my directors pound into my brain every year

I hope you feel better soon!
