I don't think anyone has mentioned the expression 'Tearing your hair out' - it is obviously an old and well-known phrase about the manifestation of frustration.
Five year olds do like to get their own way and learning that they cannot always have it is a lesson they have to learn over time with gentle help and encouragement from DP and teacher, I think jumping the gun and seeking specialist help in the first instance is rather drastic.
Professor Jason Arday - plagiarism etc


according to DS girl (well, sister) and bossy are interchangeable.