My 9 year old son, has recently taken his mid year exams..throughout the 4 days exams, he has been complaining about having headaches & tummyaches..he then completed his exams paper quickly (completed in less than an hour) and called me to pick him up from school..when he reached home, he would be fine!
This emotional side of him always happens during 1st few days of school reopen as well. Notice he just cant adapt to new schedule/or whenever there is any changes in his schedule..