Something else?

Now I don't know if Harper is sick or what...Saturday after the "passing out" thing she started running a fever.  Then she was sick Sunday with more fever/cough.  Monday she was more herself and no fever.  Tuesday sent her to school.  She napped and didn't seem herself after that and was snuggly all evening...then last night fever again.  Keith says she is fine, Harper says she wants a doctor.  Today (Wed) she seems OK...what is this thing we have going on...