It probably means you play too much Pokemon. It happens when we play or do computer work too long.
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It either means that you are currently reading one of the Harry Potter books or that you are literally obsessed with Harry Potter. Neither are bad things.
It means you are secretly a wizard- don't worry about it though, everything will become more clear when you receive your letter :)
It was written bu Inigo Imago.
He's the main character, one of the protagonists of the book, and I don't know what you mean about 'role', but I guess it's to defeat Voldemort if that's what you mean.
HARRY POTTER YOU DUMMY!!!!!
That is just a name they came up with for Harry Potter.
"Hedwig's Theme" is kind of the signature song for Harry Potter, if that's what you mean.