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I've been there.

What worked for me was talking to my manager, and arranging to unplug by taking a significant amount of time off. For me, this was two weeks initially, which I extended to three. IMO, three weeks is the minimum I would consider taking if I get into this state again.

If your manager is a good one, they will support you. If your organization is a healthy one, your team will understand and empathize.

Burnout is real, and, in my experience, it's unlikely to resolve by staying the course.