My personal little mental health trick. I have a notebook and a pen at my bed. All the negative things, the moments where I felt bad for internal or external reasons, I collect them during the day and put them in the "will write this down this evening" bucket. In the evening I take my notebook and already 90% of what I thought belonged there has disappeared. The few things that make it are safely stored there. Every 31st of December I burn the book, unread. and replace it on 1st of January.