He thought the library door would never open again, but that he would be left to live out the rest of his life rooted to the spot on the library carpet, afraid to move a muscle lest the house fall upon his shoulders. He deliberately shrugged them and shuffled his feel just to prove to himself that it could be done.
Dissociative Identity Disorder is borne out of trauma. Many individuals who survive severe trauma will later experience marked anxiety, which may or may not relate to triggers from the original trauma. Individuals with DID are highly likely to have a great deal of anxiety.