Ranch Allergy Repeat Reaction - Culver's, Tampa Florida

8106 West Hillsborough Avenue, Tampa, 33615 Florida, United States

About 7 years ago, I visited one of their locations in Colorado. I became violently I'll several hours later with vomiting, diarrhea, headache.
Yesterday, for the first time since then, I went back and had the exact same order and the exact same symptoms!
There's something that my body seems to find toxic from there :(
I ate a butter burger deluxe, cheese curds, ranch dressing, and a cherry Pepsi.
I'm suspecting it's the ranch dressing .... No more for me ;( | Symptoms: Nausea, Diarrhea, Vomiting, Headache