you need to face the anxiety. do things that make you anxious. do them many times. eventually your body and mind will stop reacting. at which point you can do something a little harder. your comfort zone will grow.
it also sounds like your thought patterns may be intensifying and creating extra anxiety. when i was doing intense treatment, they made me learn a whole host of cognitive distortions, which are thinking patterns that seem logical, but really aren't, and that lead to one feeling badly. this is a list with descriptions of them.
http://psychcentral.com/lib/2009/15-...e-distortions/ it might be good for you to read and see if you can start identifying some in your own thinking, and then try to change them. you can train your brain to think differently, and it really can releive anxiety