Ask HN: How do you survive a job you hate which is slowly making you sick?

A product owner/manager in Sweden is struggling with severe mental health issues, including anxiety and dark thoughts, stemming from a misaligned job where modernization projects move at a glacial pace due to the development team's lack of API experience. Despite having strong credentials and actively job hunting in a competitive market with high unemployment, they are seeking advice on how to mentally separate from work while waiting to find a new position, as they're concerned about potentially needing sick leave.