I think a lot of what you posted is very "normal" in our household too - the noise sensitivity (we had to leave the circus recently because she was crying after it started), the not sitting still but able to focus, etc.
Have you looked into Dabrowski's Overexcitabilities?
http://www.stephanietolan.com/dabrowskis.htm(you can google and find tons of info)
But it explained a lot to me, my dd4.5 exhibits at least 3 of them, and helped me understand that a lot of her "quirks" are typical gifted behavior.
Side note: I enjoy reading your blog (I often comment - "Karin"). How is RightStart Math going?
