If you're back is sensitive and you have pain in your legs or stuff like that, it's a flu.
If you can only take water and salads, I'd go and see a doctor. Try drinking some coca-cola and eat dry biscuits, it should be possible to eat that.
Maybe take some Immodium (against diarhoea) or Motilium (against nausea)? Though I don't know if those medicines exist in the US too, or if they have the same effect, so be careful.
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