Thank you for this thread. It is timely, helpful, and needed. I think we can all use a revisit from time to time. I have a few websites bookmarked that I found had excellent information. Most has been shared here already, but I thought I'd share one that I use when I get anxiety and need to call myself back. It's called box-breathing. You all probably have heard of it. Essentially, it is counting breaths until you can't focus on anything but that. It brings me back and grounds me in myself if that makes sense.

Breathe in, while counting 1, 2, 3, 4
Hold the breath, while counting 1, 2, 3, 4
Breathe out, while counting 1, 2, 3, 4
Hold the exhale, while counting 1, 2, 3, 4
start over and repeat until you are back in control. Usually takes me 5-6 repetitions.