A double-blind study on the efficacy of Kava for anxiety showed it far superior to a placebo. Try it!

Passion flower, valerian, scullcap also have calming effects.

Try herbal teas too.

Breathing. No, really, learning to control breath helps immensely. We tend to hold our breath when becoming anxious, thus exacerbating the situation.

Mindfulness: learning to focus only on what is actually happening...
a type of cognitive behavior skill... not allowing yourself to feed irrational thinking, thought stopping etc. (There's a list sticky posted at the top of the Psychotherapy Forum)

Good wishes!