Hello, this is Dr.Soliman and I will be your healthcare assistant. After reviewing your symptoms which are abdominal pain, vomting, watery diarrhea; this is mostly a food poisoning caused by your last meal at burger king. normally most cases of food poisoning will resolve within 3-5 days but you have to take rest and remain properly hydrated and replace the lost fluids by vomiting and diarrhea,s ports drinks high in electrolytes can be helpful with this and also fruit juice and coconut water can restore carbohydrates and help with fatigue and also avoid caffeine, which may irritate the digestive tract. You may need to use over-the-counter medications like Imodium and Pepto-Bismol to help control diarrhea and suppress nausea. It is also advised to hold off on solid foods and eat easy to digest foods like boiled vegetables, oat meal, rice and bananas and also avoid all dairy products, fatty, spicy, and high sugar content foods. I hope is answer is satisfactory and fulfills your query and my wishes to get well soon and please consider giving a 5 star rating.