I definitely have above average anxiety. And have experienced attacks.
Exercise is the biggest helper I've found so far. When I do sprints and other high intensity exercises early in the day, for the rest of the day I'm much calmer than usual. Not tired, but just relaxed and less anxious. In the long run it definitely makes me less anxious. On the flip side, when I'm sitting at the computer for several hours my anxiety grows.
Bodies like to be in motion. If you have anxiety (excess energy, awareness) use it! Or else it just grows and the excess long-term cortisol and stress hurts your adrenals. Short, high intensity exercise does it for me.