There are a number of techniques I use to counteract the anxiety or panic that can hit you out of no where.... hiding is not always possible.
I keep a small stone (well worn, smooth edged and can be picked up anywhere, handy. When I am doing well, I put the stone in the palm of my hand and let it "absorb" the positive energy I am feeling and then I put it in a pocket in my pocketbook, when I am somewhere and I start to feel anxious, I pull out the stone and put in the palm of my hand and remember how it feels to be stress free, anxiety free. I hold onto it tightly and I let it bring calm back... there is no magic in stones but they are tactile reminders of being grounded.
Another one I used is putting my pointer finger to my thumb and I set up a mind image of something that brings a loving feeling back to me. So when the anxiety hits, I simply put my thumb to my pointer finger, close my eyes and take a deep deep breath (You are in control when you are able to do counted breathing) and I let that sensation of the thumb to finger memory back into my heart, my mind and the anxiety passes.
I realize that it takes a while to get these tactile images and feelings well rooted, but if you practice when you are alright, then you will remember to do them when you aren't or feeling threatened by an anxiety... you will be able to use these tactile responses to bring you back to a more comfortable place.
The mind first recognizes the sense of touch when in a panic. So these work very well if they are practiced.
With the stone, I often will give the stone to a friend for a few hours and let their energy "fill it up" so that when I need it, my mind thinks I am borrowing someone else's strength to bring me safely back to safety....
I realize this sounds like magical thinking, but it isn't really, it's what you assign meaning to ... I hope these two help you. They have been helping me for years now. Even though I often don't get to them until I am in a full blown anxiety attack, but even then, I use these (and a host of others) to keep me grounded.
be authentically you...
it's journey, not a one day hike.