I have a horrible cold

I've been away to the south of France for a week and a half (I just got back last night), and on the day I left, I got a bad cold which still hasn't gone away. My nose is full (so my sense of smell is even less than usual) and my ears are not hearing much either, and there's the headaches (and face-aches) too (but they change so they are at least some variation). Why must this stuff always happen in the summer?
(This also means that I'm behind a lot on reading my friends-list, of course)