What Causes Fever,cough And Abdominal Pain In A Child?

Yes. My 11 year old son has been ill since last Thursday. His symptoms have been high temperature up to 105.5, minor abdominal pain, and persistent cough. The doctors ruled out appendicitis with the ultra sound, and the quick test for strep came back negative. His throat has not been hurting until today. But I believe its because he has had a persistent, deep sounding cough, which ironically he has not exhibited the three times we have taken him to the hospital. The doctors did say that his throat looks fine and they didn t believe it was Strep. However we are waiting for the more conclusive Strep test results tomorrow. His temperature tends to come down during the day just under a 100 until the evening when it goes back up to about between 102 and 103. We are giving him ibuprofen and Tylenol. His nodes don t seem to be inflamed. He is not vomiting but has had a significant loss of appetite. Finally the doctors feel fairly confident to have ruled out Mononucleosis. His neck movement is also fine. One last thing I just thought of is that my wife and I sprayed a Flea & Tick Spray for Dogs on our living room sofa within the last two weeks. It s made by Hartz and contains Tetrachlorvinphos and (S)-Methoprene. Could this be causing some of his symptoms. Thank you for your time. James