I have seen this on youtube, and I'm afraid the news is grim.
This disease, I forgot what it is called, is a nervous disease common in only crested birds, especially silkies. They will hold their head in crooked ways and walk backwards as if something on their head is bugging them.
Unfortuanatly, since it is a nervous disease, it cannot be cured, and the result is death. I'm sorry :[ Love your little silkie as much as you can now...