My three year old has not eaten more than literally, a couple bites of food each day for the past week and a half. She has been complaining that her stomach hurts but has had no bowel issues, says that her back hurts and her neck hurts. When we ask her to eat she gets very emotional and says she can't, she's full - even though she hasn't eaten anything. Last night she developed a fever of 102.2 which went away after two doses of tylenol but has otherwise shown now outward symptoms of being "sick". Should we be concerned about the lack of eating and what could be causing it? (We are, just want to know if it's justified.)