Personally I love my job and find absolute joy and satisfaction in it; but that's because I work for an organization that mirrors my values and cares about everyone; not just the team members.
This guy needs some hobbies outside of work.
I would definitely go to therapy, but apart from that, I would develop a hobby with clear goals that can be accomplished and will fill you with satisfaction.
I can't tell you how much writing my fanfictions has helped me; nothing like hitting the end of chapter 14, wrapping up a storyline, and knowing that I just created something, even if I'm apparently the only one who will ever read it.
It's still an experience.