We are an anxiety society. On a deeper level, anxiety is a yearning for a deeper spiritual life and a sense of meaning and purpose. One thing you can do is talk to yourself in a calming way. But when you're having an attack, it's difficult to talk to yourself at that time. Then it will be over quite quickly.
Meditation does help.
You can use your breath, too. But it's important to remember that anxiety is not something we can get rid of. It's a natural part of life. Working with your breathing is very helpful. Be aware of how you're breathing throughout the day.