Is there anything specific at work that's causing the stress?

I've had the same problem with work stress before, where it starts to seem like the only solution is to get out of that workplace. Over the years I've started to realize that I am contributing to my problems by not having good boundaries in the first place. Eventually I get to a breaking point.

These are a few things that helped me with the work stress:
1. Remind myself when I start to obsessively think about work when at home that I am not being paid to think about work when I am not in the office.

2. Work on plans to leave that workplace. Send out resumes, go on interviews. Sometimes interviewing somewhere else makes me realize that my current job is better than the alternative

3. Develop really encompassing hobbies outside of work that help distract me from the problems. I am not sure if you have this problem as well, but I started to lose self confidence due to one horrible work situation. Finding something I was good at outside of work (volunteering, community projects) made me feel better.

If you figure out how to set boundaries at work, please tell me the secret