Sounds a lot like my 10 yr old daughter. We are so confused because she can be so normal at times and then a nightmare! She cycles very rapidly too. She hasn't been diagnosed with anything as I am just in the early stages of gathering info about what could be wrong. I know its not anything Autism related. But I don't know what it is. And because she cycles so much we keep thinking well... maybe she's just difficult. But then it'll get bad again.