This seems to be a hot topic so here's a step by step for anyone who's really not sure how to do it and protect themselves.
Check your local laws about recording audio/visual. If your in Canada you have one party consent so as long as you're part of the conversation you can record to your heart's content. This will be your best friend.
Also check your country/state health and safety codes. Normally its got a big no no for handling food while ill, especially vomiting and diarrhea.
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Put your phone on record. Fuck if you're ever talking to your boss and you think they're scummy record it.
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Tell them you are leaving. Do not ask.
Your wording should be something along the lines of “Hey Boss I'm not feeling well and I need to leave now.”
If they argue with you simply repeat that you are not feeling well and you are leaving. You do not need to disclose what kind of sick you are. The less you tell them the better.
Now punch out and go home.
Do not answer there texts or calls. And if they want to talk to you when you return record it.
Chances are if you're in a food establishment you're required to stay home for 48 hours if you have any symptoms of food poisoning and if they threaten you with your job call the labor board and report there asses.