Dehydration or flu???? how to tell???

I am 29 and the day after Christmas I woke up at 6am, felt OK. I went to Starbucks and had an Iced Moca (1 pump moca). I went back home to lay down a bit. I fell asleep and when I work up around 10am, my stomach was hurting and I didn't feel good. I threw up twice that day.
It was weird and I don't know if I somehow got food posioning from Starbucks or what.
This was the day after Christmas... I still haven't really eaten much, just drank some liquids and had a bit of soup. I did have cookie yesterday. Everything stayed down. But I don't know if what I have is the flu or dehydration.

Since getting sick, I have had like dry chapped lips. I also feel weak at time. If I had just food poisoning and am feeling like this because of dehydration, I am gonna be mad.. How long after you throw up do you start eating solid foods again? I am just SO afraid of getting sick again. I have been drinking gatarade and water, but maybe not enough.

Pinch the skin on the back of you rhand, if it springs back you are not dehydrated but if it takes a while to spring back you are and ought to seek medical assistance.

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