My 4 year old daughter caught a cold/flu she gets a high fever 104 and I give her Advil or Tylenol to take it down,it will take one or two doses for it to go away, but it returns after a few hours . Then she gets better for a few days only to relapse, she gets sick ( throwing up) loss of appetite, but will drink fluids, Her doc said it sounds good, good urine etc... says it is a cold that is not rested... I keep her in to rest as much as possible...