Sorry to hear you are sick!
I think it's okay to just relax a bit when sick. Remember that it isn't that your body needs *more* calories, it needs *better quality* calories to heal itself.
When I am sick, these things help me:
orange juice diluted 1/3-1/2 with water, sometimes iced
light wheat toast with light butter
comfort food that is nourishing, especially a grilled cheese sandwich and tomato soup (the soup has lots of C, the sandwich is made with 40-calorie light wheat bread, 2% american cheese and a tiny bit of butter/pam spray)
lots of sleep
and of course, my Magic Chicken Soup (so named because it always makes me and my kids feel way better after drinking it. It is very simple and easy make even when you feel lousy. I do salt it up a bit for my kids). Here's the recipe:
Get better soon!