Ahhh yes...my oldest, who is now 17, put me through this so so so many times when he was young! In fact, he had "schoolitis" so bad that in kindergarten they had called me so many times to pick him up for stomachaches, that his teacher and I had to develop a strategy to deal with it. She would send him to the sick room and he would lie there for a bit and if he threw up, they would call me...if not, he would go back to his classroom after some quiet time. I endured at least three or four years of morning stomachaches with my son! I believe he had anxiety about going to school and probably really did get a knot in his stomach...but I learned to just send him anyway. It is stressful when they do this! My second, who is 4, sometimes also says he is not feeling well in the morning, although he loves school...I htink he just hates being rushed in the morning. Unless he has a fever or is vomiting, I send him...I don't want to give him the idea that he can trick me or stay home whenever he wants.