I'm by no means really worthy of giving advice, but something that always helped me after a relapse, or in initial sobriety, was to look at a clock.
As the seconds tick by I think to myself, is my frame of mind right, and am I doing anything to become the person that I have been before, can be, should be, or even an improvement on that person?
If the answer is no, then I will put things into perspective for a second and then do something so that I can say yes to those questions.
Can I cure cancer right this second? No, but I can ask my mate in the cubicle over from me how he is doing, or how his wife and kids are, or even just clean my desk. Just some kind of kindness or forward momentum in life.
I find that usually helps me quell the short term anxiety waves.