Reaching out for all medfags

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I'm sorry if this is a stupid thread, but hear me out.

Let's suppose a 1 to 2 years old kid has panic and rage attacks. He wakes up from nightmares, screams, and breaks a lot of things. When ran on a diagnosis, it is detected this child has "much higher brain activity" than other children, despite having the same skull size and otherwise normal genetics. He takes some special but unknown pill medication for some time and behaves like a practically normal child, but stops taking them and soon starts acting differently again, displaying above average intelligence, being sensitive to sounds etc.

Is this basically autism? Is there another explanation? Is there a syndrome, disease or whatever that produces "higher brain activity" that isn't high functioning autism/asperger's?

(all of this is hypothetical and no lolis were harmed in the making of this thread)