I ate Sushi around 10:30pm then woke up at 4am with simultaneous vomiting & diarrhea repeatedly for hours. This subsided for a few hours then picked back up again. I also experienced severe lower back pain. Is this food poisoning or the stomach flu & how long can I expect it to last? Also, what is with the back pain? I've had a fever too, but it usually only spikes right after a vomit/diarrhea episode.
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