When I have a cold, my number one treatment is to stay HOME and IN BED, at least for one day of the cold. Your body needs rest to fight the infection. If you will stay home even one day and give it that rest, you'll feel better sooner (even though, as someone noted, you'll still have the cold for seven days). Your co-workers will also appreciate you not exposing them to your cold, although people are most contagious the day BEFORE symptoms appear.
On the day I stay home, I do nothing but sleep. On the days that I must work, I baby myself -- drink lots of fluids, eat chicken soup for lunch, and when I get home, I go straight to bed.
I swear by hot toddies (bourbon or whisky and hot water). They're cheaper than Nyquil and produce the same effect. LOL Fix yourself one before bed and it will help you sleep.
The cats actually like it when I'm sick ... they group themselves around me in my bedroom, one on the bookcase, one on my pillow, etc., and nap with me. As long as I'm able to get up and feed them twice a day, they heartily approve of colds. It keeps Mommy home with them! LOL