ok, not for my kid - this was me - i had migraines that were in my stomach rather than my head when i was growing up. wasn't pleasant (ended up in hospital a couple of times when it was really bad). i was an anxious kid due to abuse at home so it's possible there was a degree of anxiety as a trigger for me

i'm not implying your DD has a trigger the same as mine - school can bring about so many anxiety triggers for kids! they want to play with X, X wants to play with Y... - it can be really full on developmentally/emotionally!

a lot of times i was told i was having growing pains too...