Hello. My 5yo daughter has complained of a mild headache all day. After being out in the heat (off and on, no more than 2hrs at a time), putting her to bed, she has complained about a stronger headache (more in the back of the head) and being extremely cold. We took her temp after her shower and it was 102.5. We will retake it in a few minutes. While she does have allergies she is not stuffy at all and has had no diarrhea or vomiting. Any suggestions as to what it might be or how serious? Thank you in advance!