shell-shocked(Better replace him with a fool, they said. Better pick the worst candidate who applies, they said. And they did. They picked a shell-shocked idiot from Boston. (с) 4uzhoj)
not quite oneself('He's just had a pretty testing shock.' 'A shock?' 'Yes. He's not quite himself.' (P.G. Wodehouse) – Он не в себе.ART Vancouver); not in one's senses("She is not in her senses. She is madly in love. She has been told all about him. She cares nothing." (Sir Arthur Conan Doyle)ART Vancouver); away with the fairies(Not all there; slightly crazy КГА)