Sentence:  “You did come down a wallop, didn't you? How art thou fallen from heaven, oh Lucifer, son of the morning, I said to myself. You're so terribly <WSD>neurotic</WSD>, Bertie. You must try to be less jumpy. What you need is a good nerve tonic.” 
Meaning of the word marked with <WSD> tags:  Overly anxious.