Your son appears to be unhappy at school so far and although he is already 4 years old he has a separation anxiety problem as well.He is bringing on these episodes of vomiting it seems so as to make you feel awful about sending him to school.You need to be firm with him and explain that he is now a big boy and he must go to school like all the other 'big boys'.He will gradually realise that you do fetch him every day when school is over and as he makes friends at school and settles down this stage will pass.
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