Tapping is the way to go.
For those who are not familiar with it here's a introduction.
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Tapping is a proven method to get rid of anxiety and phobias.
The first exercise can be very well used in field.
You tap your karate chop-area of your hand with your other while saying affirmations. Doing this releases endorphines and will help to calm you down.
(That isn't me btw
)It's hard to notice and it works well.
Try it out next time you're out and feeling anxiety.
-Jav