Vomiting along with a mild temperature of 99?F after eating ice cream is usually due to a minor stomach upset, such as food intolerance, mild food infection, or irritation of the stomach. In most cases, this is not serious and improves within a day or two. The most important thing is to stay well hydrated; sip small amounts of water, oral rehydration solution (ORS), or clear fluids frequently. Avoid heavy, oily, or spicy foods for a day or two and stick to light foods like rice, curd, bananas, or toast once you feel better. Rest is also important. You can take simple medicines for vomiting or fever if needed, but only after consulting a doctor or pharmacist. However, if vomiting continues, fever increases, you are unable to keep fluids down, or you notice symptoms like severe abdominal pain or dehydration, you should seek medical care promptly.