What would you do?

Scenario: You have an eight year old daughter. She has been complaining recently of severe headaches. She soon begins to black out during the headaches. Things get progressively worse. During her "black outs" she begins to talk in a completely different voice. The sweet voice that you normally hear is now a very low raspy voice that you would normally hear coming from an older man. She begins to talk to you in a very authoritative voice and often uses curse words. She normally wears glasses as she is far-sighted, but when she speaks in this voice, she no longer needs the glasses and your little girl who has always written with her right hand is now using her left hand to write messages on the walls of your house. As time goes on, she begins to try and use weapons on you and her siblings. She is very violent during these black outs but everytime she kind of snaps out of it and has no recollection of her odd behavior.

What would you do??