Have you found any alternative train of thoughts that work?
I guess that's the question isn't it, what is the objective in stoicism, or mindfulness? That these two things have cropped up in this thread is interesting. Both have been used by me in order to try to escape my pain, rather than facing up to it and trying to work through what is causing it. Avoidance is sneaky.
If one is at the point where one has a relatively normal life, the basic things that provide well being. Decent income, decent social support, relationship (if one wants one), security, and feeling relatively accomplished, then I think things like stoicism and mindfulness etc can be valuable.
I remain undecided as to their value before then at least for me, because they can be used as avoidance. It's certainly how I have tried to use them before.
Mindfulness probably has more immediate value to me in reducing cortisol and worry. But so would progressive relaxation or wandering about outside or whatever, so yeh.
Honestly, embracing self honesty and even "superficiality and competitiveness" in a more controlled way have been more effective for me than either stoicism or mindfulness. It's just those things are seen as less noble and spiritual, but in many respects they get the job done, whatever that job happens to be.