Great article Tracy!
As I'm getting older, I'm finding that worry affects me more and more. My jaw gets tight and painful, my muscles hurt, my digestion is thrown off!! And, you're right, my body goes through the experience as if what I'm worrying about has actually happened, even when it hasn't.
Often this happens if I wake in the middle of the night. If it's before 3:30am, I'll stay in bed, and repeat over and over, in my head, "I love you." I'll just say that over, and over, and then generally I can fall asleep. If I'm up till 4am, I just give up and get up. I can usually find something to distract me, and the worrying is over LOL.
Breathing deeply too, that's a huge help.