There are three things that I do most often. I go and sit at a park near my office and listen to relaxing music. I mean the music you hear if you were going to do yoga. I take walks. While walking, I touch and feel as many things as I can. I find that this takes my mind off of my anxiety while it subsides. Lastly, I take pictures to describe my anxiety. While this doesn't help immediately, it helps me put my anxiety into perspective. I go and look at any photos that I have taken and I then remember what i was thinking when I took the image. On most occasions I find that my anxiety was unwarranted.

These are things that worked for me. I tried a bunch of things that didn't work. You'll likely have to do the same. It'll take time, but you'll find it.