Food Safety Report: In-N-Out Burger, Redwood Highway, Mill Valley, CA, USA 1 year ago • details 9 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Stomach Pain, Cramps, Chills, Headache Suspected source: In-n-out Onset: Right away Duration: 4 to 12 hours Sick: Me