I had this when I was on holiday couple of months ago! I got ill on the monday night and felt marginally better on Thursday (well I wasn't wasting the dive trips booked) and Sat I was much better....
My point? Take lots of rest if possible!! Sleep def helped clear this up. Have also been recommended a dollop oh runny honey, some squeezed lemon juice (or the bottle stuff if you're weak) and hot water!
Hope you get better for Saturday
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always trust the jean jeanie
love many, trust few, learn to paddle your own canoe