Drink lots of water: A warm fish and mayo sandwich? That was a bad idea :) You very likely do have true food poisoning which most often is from a toxin formed by the bacteria staph aureus, commonly present in warm mayo. This should pass in 24 hours. You can treat the nausea with medication (Rx ondansetron, Rx promethazine, OTC pepto) but it's best to let the diarrhea run it's course. Seek care if no improvement.
Answered 2/3/2016
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