Ex T used mindfulness, but back then we didn't want a bar of it. Fast forward 20 years and I needed to deal with / resolve a current stressful situation with very limited resources, one of the few available being a mindfulness course, so I took it. I didn't like the way they did it, but I adapted some of the techniques for ways that suited us better and found them helpful.
I had two very intense examinations this week, in which the outcome (pass or fail) will make a huge difference to our quality of life. (It will either go up a little, or down a lot). In the two weeks leading up to the exams the anxiety levels were sky high, then in the last week conversations with a friend and my T reminded me to use the mindfulness and EMDR techniques that we have. I found that in the days before my exams the anxiety level was about 2/10, and in the exams themselves it was more like a 1.
I am not one much for sitting down and meditating, but I like to practice awareness of self, tension, breathing etc, and to practice being fully present in nature. Those techniques seem to work best for me.