I'm so glad that you have got someone to listen, and please do update us on how things are going because i'm very interested to know. My 3 year old is just like your child and he can often get hypo, will not listen, hits us and his 1 year old brother. Depending on his moods will depend on whether i can have him around other child (sometimes) because he can be nasty and hit other children. He's rather loud aswell. I have seeing GP's for the past 6 months for referrals but to no avail. Because my DS is a twrrible sleeper, it has been put down to insomina for his bad behaviour and tantrums ...... but funny enough, no one has diagnosed him with insomia.