I'm sorry you are having an awful day.

Are you certain it was the Crisco in the cookies that made you sick two years ago? How many cookies did you have back then? Today's pie crust: how does its volume compare to what you ate two years ago?

Regarding your brother, there's nothing wrong in recognizing you have only so much tolerance for certain of his behaviors. As the situation permits, excuse yourself when necessary to "recuperate" and get some needed rest and peace. We all have our limits.

May the rest of this day and week be easier for you.