I think that mindfulness is a great idea. It's powerful to have a regular practice of it, and of course it is valuable in how we experience stressful situations (like the ones that bring us here? )
I would add that mindfulness also increases one's tolerance for experiencing painful/anxious/stressful situations without having the narrative mind go buck wild.
The best book I've read on the subject is Jon Kabat-Zinn's Wherever You Go, There You Are.
Incidentally, I read the book on overthinking that you had mentioned. While Dr. Nolen-Hoeksema's case studies are females, I did find a lot to take away from it. I appreciate you bringing the book up.
M: 32 W: 29 T: 9 Years M: 4 Years I hit rock bottom: 2/11 PA admitted: 4/11 WAW: 5/11 D filed: 6/11 now: Patience, wisdom, and growth - hopefully.