Food Safety Report: Dairy Queen (Treat), North Londonderry Square, Palmyra, PA, USA 2 years ago • details 10 Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Fever, Stomach Pain, Chills Suspected source: Mint brownie blizzard Onset: Less than 4 hours Duration: 12 to 24 hours Sick: Me