I go through anxiety and depression on a pretty much a regular basis, but I can get rid of the waves fairly easily. Find a spot on the floor, lay down a jacket or somthing and sit. Clear your mind and breathe, and feel the world pulse around you. The anxiety should subside substantialiy.
After you find some sort of temporary peace you have to find exactly WHY you become nervous and anxious. I do this in one of two ways.
Engage in a dialouge with someone that asks basicly asks you questions and nothing but about your anger/ depression/ anxiety/ whatever. Eventually, you will find the root cause.
The second way is to do the first way by yourself, and much harder. You have to clear your mind and focus on what are the causes, which often lead to more causes. If it is an irrational fear, (which it very well may be) you have to try and find why you have the fear, then why you should not have the fear.
Even if you fail at dispelling the axietal cause, it can work wonders just to know what it is thats assaulting you.
oh yeah ^^