I had a bad case of the flu and got somewhat dehydrated, even though I was drinking some water, I had not eaten anything for a day. As a result of that, I fainted in the bathroom and badly broke my ankle (I'm lucky that I did not break my neck :-)). I ended up having surgery on the ankle on Friday (screws & metal plates) and am now on the mend.
Of course, hopefully, you will not get the flu at all. But if you do get catch it, make sure that you get plenty of fluids. Something like Gatoraid (NAYY) will give you some electrolytes as well as some calories. Then you will not be left with some unexpected side effect, like I did.
Bev in TX