Food Safety Report: Wendy's, West Valley Parkway, Escondido, CA, USA 2 years ago • details 101 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Stomach Pain, Cramps, Chills, Headache Suspected source: Wendy’s burger Onset: 12 to 24 hours Duration: 12 to 24 hours