My 2.5 year old daughter got a fever of 102 out of nowhere yesturday, a few hours later she threw up (she hadnt eaten all day but had a little bit of juice, which is what came up). A couple hours after that she started screaming and crying that she hurt, when asked what hurt she said her back and she d hold her lower back. She is not constipated. This went on for about 8 hours last night before she finally fell asleep. Today she seemed alright till the afternoon when she got another fever. She then slept for 3 hours and woke up seeming well again. Later in the evenig she started screaming about her back again. She throws herself onto the floor or couch screaming in pain. Tylonal doesnt seem to be helping for anything but the fever.