Question: Hello. My two and a half year old came down suddenly with a fever at Midnight Friday. Excessive chills leading her to shiver. The fever was 102.9F. She screamed quite a bit with discomfort, then vomited a bright yellow substance up at 3AM. Later that morning (9AM) while in a coughing fit, she threw up a yellow substance again. She was unable to tell us if she was in pain and what was wrong. We took her to the pediatrician at 1045AM. He tested for strep (negative) the flu (negative) and took a urine sample and found nothing out of the ordinary. He advised to watch and see, seemed puzzled by the bright yellow vomit. She slept most of the rest of the day, ate a little bit of cereal and a banana and drank some water.The fever finally subsided around 3AM Saturday morning. She did throw up the same bright yellow substance during the night after coughing. Today she ate rather well, XXXXXXX juice, cereal, water, fish sticks, some chicken. She is up and moving around, much like herself. However, she has had terrible gas and has passed incredibly foul smelling (out of the ordinary) stool twice this evening between 5PM and 9PM. Her nose seems to be getting runny. I am wondering what in the world is going on? Is this virus both upper respiratory and gastro? Thank you for your help.