Force liquids - water and tea (no soda or coffee). I highly rec TheraFlu in a cup of hot water. And keep after your temperature - drink ice water or take a very cool shower to cool your body down. (Never underestimate the damage caused by having a high temp.) And the resting as suggested.
I'm near the end of my upper respiratory infection, so I sympathize most dearly. Changing your pillowcase also helps with comfort ... a clean pillowcase always feels nice when sick.