Food Safety Report: Walmart Supercenter, South Duff Avenue, Ames, IA, USA 2 years ago • details 173 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Stomach Pain, other: Insomnia Suspected source: Not sure Onset: 4 to 12 hours Duration: 4 to 12 hours Sick: Me Additional information: Pepperoni