No, not really. I'm also not sure it is a stomach virus. That's part of why I posted the question.
In some cases, it may be that we just aren't used to eating certain foods, or maybe more the combo of greasy/spicy foods followed by theme park rides.
Like twice we ate the Boardwalk Deli. First time we ate there was great, but the second round of sandwiches (months later) was very greasy. Dripping level of greasy. Plus cheese and sauce! It was a LOT of grease.
We normally eat way more produce than we can get with our meals at WDW. Often if we do order a (side) veggie, it is terrible. I was recently excited to see green beans at Boma, but then I bit into them and they were not good. Not at all fresh. Another night the veggies that came with my dinner were minimal and inedible. I got two small carrots, and they were extremely tough to chew. I don't even know what one does to make a carrot that texture!
Yak and Yeti was great: our meals came with real servings of fresh veggies, plus a side order of bok choy that was excellent.
Maybe we've just had a round of bad luck at WDW.