I know how you feel man. I used to work in a job like that. Honestly what saved me was reading some comedy manga on mangadex. Since it didn't require a lot of brainpower and I could just stop reading it whenever I wanted it was perfect for times like this. My head also was in a much better state than after scrolling back then reddit for hours. If you don't like manga you could just find some easy book.
If you can't go for a walk during work go before or after work. I try to cycle every day after work and it always makes me feel better.