I just did a little Googling on Bush and seizures. I found a source for the quote in the original post at
http://tbrnews.org/Archives/a876.htm Something like this would certainly explain why they can't let Bush testify before the commission without Cheney.
Google also turned up some interesting information on seizures in general -- including the suggestion that people who have visions or who experience God talking to them have generally been affected by epilectic or other seizures. So when Bush says he gets advice from his heavenly father, he just may be describing the literal truth.
Scary, no?