Many hugs, drink!
Have you tried one of the neti pots (sinus wash)? I start using it about this time of year, and use it all winter, usually once a day in the evening. It moisturizes the sinuses (great for Sjogrens), it washes out all the icky stuff, and I'm sure it was one of the reasons I didn't catch a cold all last winter.
Other than that - rest. Sleep and do what you can to stay away from having to THINK. I hate brain fog. I feel like there's cotten batting stuffed between the little synapses in my brain, and I can't think through the batting.
~"I find hope in the darkest of days, and focus in the brightest. I do not judge the universe." (Dalai Lama)