I'll just interject here my daughter with low blood pressure would complain of a stomach ache at school and at bedtime -- stereotypical kid trying to get out of something behavior, right? But she wasn't trying to get out of something, when she sat still or lay down her blood pressure dropped and she wasn't getting enough oxygen to her stomach. Sometimes there is a wolf, even if they cry it a lot, do keep an open mind! I had a very hard time with the teachers who never believed her until she vomited. I think it's very frustrating to be a little kid and be telling the truth and be not believed because the adult has experienced some other kids lying.