It sounds like you are doing the right things. You can still track your food while you are sick, and try to keep it at the lower end of your correct calorie range. But with the flu you really do want to rest as long as you're sick, or it will take longer to get over. I had a flu a few weeks ago, and I made the mistake of trying to be active before I was really over it, and so it took longer. You can always pick up your program where you left off when you are all better!
My Sparkpage is set to private, but I'm open to SparkMail!
"People often say that motivation doesn't last. Well, neither does bathing--that's why we recommend it daily." - Zig Ziglar