Once, years ago. It is such absurdly unlikely as to not be worth worrying about.
I 100% promise you you haven't been poisoned. You're just suffering from paranoia and anxiety. I promise you're fine and need not do anything. You're probably more likely to be killed by a bolt of lightning.
I'd tell you to go to the hospital if you're worried, but I really don't feel right suggesting that since it would be a waste of medical resources where virtually anything else they could wind up being used for would be a better use if them than your case.
I'm not trying to have a go at you here, I understand you're suffering from anxiety and can't help how you feel, that's not your fault and you're not in any way to blame for anything here, you've done nothing wrong, just try and remember there's no virtually no risk whatsoever that you've been poisoned. You'd be far far more likely to be run over and killed by a car in the way to the hospital than you are likely to have been poisoned. That's not a joke, you really are in more danger from being killed in some traffic accident going to the hospital than you are in danger of having been poisoned.
So try to reassure yourself that you're at no remotely plausible risk, and try and do something to help your anxiety.
You'll be ok, I promise you haven't been poisoned.