Is he writing and spelling at 3rd grade level? If so you might allow him to write short storys or long storys? Possibly he could also illustrate them if he likes to draw or is artistic. It is concept that allows child to have control over sisutation. It also allows wonderful oppurtunity for building selfesteme. You might help him with printing his own book. When he evaluates all possibilities involved in different process of writing books it allows new perspectives that possibly would alieve his frustration. If he isn't artistic, takeing pictures to put in book as illustrations is also great way to express hisself These are things I have tried that have worked. Hope ideas are of some help. Your son sounds like a delight to have. Wishing you the best.