My son is 9 years old and has had abdominal pain around his belly button for 5 days, ranging from none to severe enough to cry. We did a rapid strep and it was negative. Went to ER last night and the WBC was normal as well as the inflammation. My son felt very good after the blood draw and did ok through the day, but now is hurting again. He has no fever, no vomiting or nausea, though he was nauseous 2 days ago. His temp is low and he is lethargic with pale skin. I am concerned about the appendix, but I don t know. Should I go back to ER tonight? His pediatrician is gone until Monday, so if I take him to a doctor during the day, it will be one he has not seen.