The biggest tip I have for you: Drink as much water as you can stand. It really does help flush your system out. Drink at least a gallon a day.
Long hot showers help clear out the sinuses. If you like spicy foods (I sure do), while you're sick is a great time to enjoy them.
Zicam and Airborne seem to both be effective immune system boosters - I've used both and like Zicam better. However, these are most effective if you take them right at the start of a cold, so it might be a bit late now.
Echinacea is an herbal immune system booster - one of the few that's actually been proven to work. Any supplement store (or even Trader Joes) carries it.
Someone mentioned nyquil and/or sudafed. These are great to help you sleep, but I can't stand the groggy feeling during the day. It's good to have these on hand for nighttime though. Tylenol PM is just acetaminophen and benadryl, so that works fine too.
Some people recommend high doses of vitamin C - 1000mg a day or so will certainly help with a cold but I disagree with those that say to take several thousand mg a day, your body can't process vitamin C that quickly, all it will do is turn your piss orange and stress your liver.
I tend to get a lot of colds because my job has me going in and out of different offices all the time, I get exposed to a lot of junk. Hope you feel better soon.