It is not going to mess up your metabolism if you don't eat your minimum calories while you're sick. It is also not going to mess things up if, while you're sick, you eat just chicken soup and toast (and even if it was white bread, at that). We're talking a temporary period of time, a few days or a week here. Your appetitie will come back and you'll go back to normal eating.
As for exercise-- I've heard it said that if your illness is from the neck up (a head cold or something), go ahead and exercise. If it's the neck down (chest congestion etc) don't fret so over trying to exercise. If you've got a bad cough and had a respiratory infection.... really, a little walk like pp's have suggested is probably about the most you should attempt. The problem with trying to jump back into things too quickly, is that it often leads to a setback and only makes things worse. All your good efforts will not go to waste, if you take the time off to let your body heal.
I'm going to guess that out of all the things you "need" to accomplish on a daily basis-- get the kids to school and go to work are probably more important than exercise. If you can get those things done and feel up to it, take a little walk. Yes, it's important that we put ourselves on the list of priortities and make time to get healthy and fit. But in this case, getting healthy may mean lying down, more so than getting some exercise.
Ruth in Cookeville, TN Central Time Zone
Promise me you'll always remember: You're braver than you believe, and stronger than you seem, and smarter than you think - Christopher Robin to Pooh
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