When I get anxious at work I first go outside and smoke a cigarette, then if that doesn't work I do some tapping and deep breathing, and then if that doesn't work I take a klonopin. If that doesn't work, I usually repeat the process over. After that I go home.

To do deep breathing, breath in for 2 counts through your nose, then breath out 4 counts from your mouth. repeat.

Tapping takes a bit more. It involves using your first 2 fingers and tapping certain points 7 times (or any odd number of times) and while doing this you say an affirmation like "despite my limitations, I am no different from anyone else" or something more affirming. You can look it up online, there's probably guides to do it out there somewhere.

Good Luck.