The Doctor often undergoes post-regeneration trauma (the Eleventh Doctor binged on stuff like fish fingers in custard etc.), and this one seems to be quite a doozy, but it was something that the Doctor was expecting, hence the phone call. ;) Having said that, I felt that it dragged on too long, it wasn't really until the Doctor and Clara met up in the restaurant that we started to see this Doctor's true colours (the way that he allowed Clara to believe that he was abandoning her was interesting). I also found it interesting that the episode hinted that the Doctor may have deliberately (albeit subconsciously) copied
someone else's face, which would canonically explain why we're
seeing it again.