Food Safety Report: Five Guys, East Broadway Street, Missoula, MT, USA 1 year ago • details 33 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Stomach Pain, Cramps, Headache Suspected source: Burgers Onset: 4 to 12 hours Duration: One Week Sick: Me. I'm not sure I got it here but started feeling worse after eating here!