Oh that sucks. I've had that reaction to some of the alternative artificial sweeteners they put in food or candy. Same result, your intestines feel like they have run a marathon and all you want to do is sleep all day to recover. Or just lie a fetal position on the floor and listen to Celine Dion albums for hours on end.
I checked and the veggie stuff contains allergens like Soy. Also, the buns are not gluten free unless you ordered that and they screwed it up (wheat/gluten, milk, soy, eggs, sesame). The fries are cooked in peanut oil. Their mayo contains soy. Also their milkshakes contain peanut/peanut oil. So there are definite allergens you have been exposed to. Something in there triggered you to have a reaction.
Anyway, it's a full on cleanse of your system. I don't see how people actually want to do those. Doing the cleanse for a colonoscopy gives me the sweats and shakes just thinking about it. Ugh!! NO!