Despite practing stoicism and being a general easy going and chill dude the same thing happened to me. Due to a toxic workplace, I got very close to a burnout.

I tried changing myself for months at an end, started doing more exercise, built up a bigger social circle and started dating. In the end it worked because it gave me a bigger social circle to share my crazy work stories with and to validate that it really wasn't me but that things were unfair and very stressful. I raised my frustrations and issues with my manager several times but nothing changed, if an organization doesn't want to change at some point it becomes a burnout factory.