Popcorn works better, for both fish and ducks.
I have some familiarity with anxiety disorders. There's a biofeedback videogame I got after I got sued a couple of years ago (long story, not that interesting) that has really helped me out. I was able to use it to find some good strategies to help myself calm down when I'm getting into a negative feedback loop. The game is called "The Journey to Wild Divine" and you can see more at
http://wilddivine.com. Used copies are usually available on eBay etc.
Best of luck!