I was once in your shoes back in 97 when my anxiety battle begun. As Greenlydia says, agrophobia is the cause of your reason for not wanting to leave your comfort zone which has everything to do with anxiety. Once i started med's and began to conquer my problem by seeking professional help and educating myself by reading books on anxiety disorder and it's symptoms, my symptoms began to fade about 6mos later. Although Anxiety is not curable, the symptoms are treatable once you learn how to control the panic attacks.
It may seem like a far fetch to get back to normal but you will just hang in there!
Sounds like your anxiety has morphed into agoraphobia. I would strongly suggest you post over on our Agoraphobia Forum...............those folks will have a great deal of good advice and support to offer.
Best of luck
Peace
Greenlydia
i stay pretty stressed out but it hasnt gotten to that point, add me if ud like and wanna talk