Hi, you named , grape soda,
lollipops, and fruitloops. anything purple in color. i noticed all the things listed also have white sugar. Do you get sick when you eat eggplants or plums? Also, do you get sick eating red lollipops?
I'm just trying to help you narrow the food down that makes you want to vomit.
I wonder if anyone does know if people can be allergic to the purple dye that is used in purple foods? Thats a good question too.