Food Safety Report: Culver’s, East Main Street, Owosso, MI, USA 1 year ago • details 15 Comments Comment Suspected food poisoning. Symptoms: Nausea, Stomach Pain, Cramps, Headache Suspected source: Not sure Onset: 4 to 12 hours Duration: 12 to 24 hours Sick: 2 people Additional information: Both my husband and I ate fish