My 3 year old has woken up around the same time for the past four nights, crying and then vomiting. During the day she seems fine, she has only had a decrease in appetite over the last two days. She is running a slight fever thats around 99. I took her to the ER yesterday and she was put on amoxicillan because they said that she has a bladder infection. She is still vomiting. WHat should I do?