Gee Macpweet,.. sorry to hear that. Not a very nice way to end the year. Specially for the neighbours.
Did you check the label for aspartame? MSG? BPA's?
I should point out that the most common cause of food poisoning is not washing hands, specially for food that you eat with your hands, and specially from oily food which you eat with your hands,.... like say,.. pizza for instance.
The oil in the pizza base is an ideal germ transportation medium from grubby hands straight into the mouth.
Not that this could have had any relevance to your case of course because I'm sure with all your conscientious observation of health risks, you would have scrubbed your hands within an inch of their lives prior to eating anything.
But then maybe that last minute dash to the toilet, or the inadvertent scratching of the ass or nuts prior to eating the pizza may have had some bearing on the event.
Anyway,. macpweet,.. get well soon.