my 9 year old son as been sick for 2 days now, he is vomitting and he legs ache. Now he says his head hurts too and that he has never felt so throw-up sick in his life. I have tried giving him ramen noodles, crackers, sprite, vanilla ice cream, and just warm water. Everything just comes right back up. Is there anything I can give him to calm his stomache? Or should I take him to prompt care?