Maybe overwork exacerbates things, but sometimes it's just chemicals wrong in the head. It can be dangerous to treat major mental illness without addressing the biochemistry. In general I am not pro medication, but breakdowns can be deeper than work. Of course an 80 hour work week won't help an already unstable person.
Agreed. I think anyone in this situation should definitely consult a mental health professional. Depending on the factors though it can be a variety of things, and it may be a case of someone who does have a chemical imbalance but is normally fine if working at normal levels, but the overwork can push them over the edge.
Perhaps, but I believe there's a close relationship between the two. Getting the balance wrong can definitely lead to mental health problems.