Not that I have major traumas, but for minor anxieties, the containment method that comes to mind is the one I've been using most recently for an event I need not to dwell on dreading until I get some idea of when it's going to happen. It's something I half-remember from Dan Simmons' The Hollow Man, and it just came to me one day when I was trying to push the anxieties out of my mind.

It's the idea of burying the thought and smoothing the leaves over the spot until no one can tell that something is even buried there. Now that I think about it, I distance it further by giving it a very blurry visualization, and giving it a vertical orientation, like a painting rather than imagining myself actually bending over the physical earth. But the image of reaching out with my hand and smoothing the leaves of a painting over the ground is very soothing and is working for me.

It's like mnemonics: whatever works.