Not quite the same as the flu (although the pain meds made me throw up), but when I had my wisdom teeth out I lost 10 pounds in a week. Once I started eating normally though, it came back on. So, until you get better and are feeling back to normal, I wouldn't worry about it.
I do agree that you need to be getting plenty of hydration. When I'm sick I drink Vitamin Water Zero, in the XXX flavor, so I'm at least getting some vitamins in.
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