Food Safety Report: Oscar's Frozen Custard | Waukesha, East Moreland Boulevard, Waukesha, WI, USA 6 months ago • details 13 Suspected food poisoning. Symptoms: Diarrhea, Stomach Pain, Cramps, Chills Suspected source: Hamburger Onset: 12 to 24 hours Duration: 12 to 24 hours Sick: Me