What Causes Constant Nausea And Vomiting?

My daughter feels sick she has been vomiting all day long feels nauseous ,can not get comfortable, can not sleep and can not take a sip of water without vomiting, she did drink last night but also had hamburger and other food to eat ,she seems to think the symptoms are more from the food then drinking what can I do for her. My email YYYY@YYYY