Hello, over the last three days my 4 yr old started having different symptoms. Nausea the first day, upset stomach from time to time the second day, and a extreme headache with fever . After a few hours the headache went away. Now she just woke up and vomited thick yellow substance with chills, fever, slight neck pain . Is this something I should go to ER now, or an urgent care in a few hours once they open? Thank you