I don't know if your doctor has weaned you properly from the Klonopin to the Xanax to the Ativan. All of these meds need be slowly tapered and slowly replaced with the different benzos.
You ask, "what can be done once you've exhausted the feeling of benzos and all others like CBT........" You do know that CBT is NOT a drug, it is a type of therapy. Cognitive Behavior Therapy. Were you ever in this type of therapy?
Given the difficulties you are having with your meds, combined with the agoraphobia, I strongly urge you to speak with your doctor about getting a referral to a psychiatrist who can not only help you find the right medication for you, but begin to help you deal with the anxiety and the agoraphobia issues.
Please don't hesitate to get the help you need.
Peace
Greenlydia