To make it through the last stretch of the year, you need to be in optimal health. Make sure you're eating right and not overworking yourself.
Be sure to get a flu shot if you haven't already. It takes about two weeks for the vaccine to start protecting you from the flu, so get it as soon as you can.
Check to see if you can get it through your employer, your doctor with your health insurance, and pharmacies like CVS and Rite Aid. You can even get it at superstores like Costco and Walmart.