I had a similar attack today and again came close to white knuckling. But I said to myself, why are you getting worked up over this? You don't drink, and never will again so you're worrying about someone else's problem: the Beast's. The Beast is worried, you don't need to be so calm down.
And then it went and I did indeed film calm.
I'm conscious of the fact I still don't fully feel like a lifelong non-drinker and I think it's making me vulnerable. Are there any exercises the engrain the Big Plan into your mind?