It could have been everything , and it could have been nothing . I think I was past caring . I walked , because there was nothing else for me to do . My chest still felt tight , like a coil wound .

Question: Why would someone feel that the narrator is being difficult ?
Answer: The narrator is always difficult to work with   - this is not new .None of the above choices .The narrator is feeling overwhelmed and is showing it .The narrator is naturally grumpy and always like this .