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Ideally, all tasks should be completed before you go off work or on vacation. Otherwise just the thought of the work ahead will trigger stress again.
Unfortunately, this is not always possible. If you can, you should delegate what is left behind to a deputy. Where this is not possible, a to-do list can help. It takes away the fear of forgetting something and prevents you from going over the tasks at hand in your head over and over again. Once you’ve written it down, you should banish this list until you get back to the office.