Breathing is crucial. I have heard that it can be more helpful on taking slow exhales--it's easier to focus on than the inhales.

Also, progressive muscle relaxation is a HUGE help. It's a method of tensing your muscles and then releasing--it kind of squeezes the anxiety out of you methodically. If you google it you will learn more.

Do you have a smartphone? Look at the apps. I have an iPhone app that specifically coaches relaxation breathing, and another that does muscle relaxation and imagery.