Re: Serious problem with DD. Need help :(
I agree with the above. My 2 yr old sometimes has similar night terrors, though not quite to that extreme. No one can comfort her, she is completely out of her mind and screaming as if someone is stabbing her. Her episodes don't last quite as long and she doesn't tear through the house.
One thing my sister suggested, that she did with her son when he went through a similar experience for a short time around the same age, was to take a wet wash cloth and wipe it on his face. The effect was that it woke him up, kinda shocked him out of it. Because despite appearing wide awake, eyes open etc, they really are still asleep. I don't know though if that would be advisable with the as extreme as she gets. Three hours is extreme.