Food Safety Report: Firehouse Subs Stonewall Square, Mechanicsville Turnpike, Mechanicsville, VA, USA 11 months ago • details Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Stomach Pain, Cramps Suspected source: Meatball Sub Onset: 4 to 12 hours Duration: Less than 4 hours Sick: A loved one Additional information: Still watching/monitoring child