Suggest Remedy For Constant Throwing Up Post Food Intake By A Child

Hi, how are you? I would like to have a question for you , please tell me what to do for my kid getting better. My little girl she is almost 6 year old , the last 3 days every time she eat something and a few minute later she throw up and she cried , and she didn't want go to school please help me what to do for her. Thanks