I've heard that certain scents can be calming. Such as lavender-scented airspray, or cinnamon candles, or different fragrances/oils...

It also helps with the distraction from anxiety, if you focus on it, and let it calm you.

I read this in my CBT handbook. Basically, you can use all of your senses to your advantage, and focus on them to distract yourself. Such as petting the soft fur of a purring cat (that always takes me down a few notches when I'm feeling up in the air), or a nice warm bath. < that's my favorite. For some reason I like bathing in the dark. Then its just warmth all around you, and the comforting sound of water.

And after, I feel clean, like a new slate.

Also, a good one for me is to listen to positive music. Think Katy Perry's "Roar"
I don't even like pop music. But most of the stuff I usually listen to is admittedly depressing. So an occasional happy song tends to lift my mood.