Food Safety Report: Cheerios, Costco Wholesale, West University Drive, McKinney, TX, USA 2 years ago • details 67 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Stomach Pain Suspected source: Cheerios Onset: Less than 4 hours Duration: 4 to 12 hours Sick: Me Additional information: Happens every time. Tried different milks.