My daughter is 2 years old she started running a fever yesterday, ran one all night and woke up all threw the night crying with stomach pain. This morning her fever got up to 104.5, has rapid heart rate, very sleepy and lifeless. Went to local er. They did strep test, urine test X-ray on bell and blood work. Said everything came back fine but her white blood count was 18,000. Said it was probably just a viral infection. Since then she still has fever, has threw up 4 times yellow-greenish vomit and I can t keep her awake. Could this really be just a virus or something more serious?