Playing guitar, reading, sleeping. Nothing is more cathartic for me than cranking up my amp and just making some noise.
Also, sometimes a quiet space can bring me back. No distractions.
I wish I could still get away with doing this but...when I was a kid, I used to hide my head under the cushions and pillows of my couch when things got to be too much. I could stay like that for a long time. It was my own world that nothing could shatter.