Food Safety Report: Lobster, Barrie, Ontario, Canada 1 year ago • details 40 Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Headache Suspected source: Lobster Onset: 4 to 12 hours Duration: Several days Sick: Me Additional information: Vomit & diarrhea were both black. Do not think it was blood.