DH is having a bit of a work-related mid-life crisis. He's someone who's very successful in his career but has recently made a couple of tiny mistakes (totally non-consequential stuff) and because he is so defined by his professionalism and his career, these mistakes have affected him really badly, making him feel like a failure, and anxious.
So I'm looking for book ideas, either about how to cope with work when you are a perfectionist, or something more general about not defining yourself/your sense of worth through your job. Or any other work-focussed self-help books you think might be useful in this situation. Thank you!