Afather brings his 6-year-old son in to the doctor's office. he says his son just began first grade a week ago and, after attending the first day of classes, has refused to go to school each day since, complaining of stomach cramps and nausea. he says he has spoken to the boy's teacher, who says she did not notice anything unusual with her interaction with the boy, other than perhaps a bit of homesickness. after the nurse examines the boy and finds nothing wrong, the father asks how he should handle the problem. what action should the nurse recommend?