I've never posted on this board before but I saw your post and felt I had to respond. I'm sorry none of the regular folks here have been able to help. Perhaps no one with agoraphobia.
I don't have agoraphobia either but I know a lot about panic attacks. I have severe PTSD from childhood abuse. PTSD is all about panic attacks. We have things that trigger us and we can literally go "out of body" from the intense panic. So I do understand.
But whether it's PTSD or agoraphobia, it's all the same physically and you can do something about it. Something in your mind is making your body release adrenaline...the "fight or flight" hormone. Your Xanax and Klonapin are both benzodiazepines...in the same family...and both anti-anxiety agents. That is one way to counter act the adrenaline. Another is to use it up with exercise(it does make you want to fight or flee). How about setting up a driving schedule where every 1-2 hours you stop and get out and walk around or do jumping jacks or some kind of exercise for a few minutes to burn up some of the adrenaline. Take some of your favorite music with you and try to meditate with it by closing your eyes(hubby is driving or you?) and concentrating on your breathing while listening to the music carefully. The exercise will burn the adrenaline while the meditation will suppress it.
You've already started to understand the psychological situation...that it sets up for no particular reason but once you realize you won't die if you leave home, it gets better. I really applaud you for taking those steps. Great job!
Now start to address the physiological side...the release of adrenaline from a set response that you no longer need or want.
I bet if you figure out a way to burn up and control the bursts of adrenaline that you'll be fine. Your body has developed a set response and even it doesn't know why. So until the brain "gets it" you have to deal with the effects. Do your own version of "fight or flight" by fighting it by exercising it off and flight by flying off into a deep relaxation state that stops the release.
Do I do this? You bet I do! When it starts for me, I do housework or walk or do some hard gardening. Once I burn off a little bit, then I totally relax by sitting back and meditating to a good piece of music. If you are religious, prayer is a form of meditating.....you just say it over and over to yourself while breathing deeply and letting your body relax.
But have this planned. Where you'll stop and what you'll do...a brisk walk? Use a gas station rest room to do some fast jumping jacks or wall push ups? Out in "nowhere land" where you can get out and give off a good scream and run around in a circle for a minute or 2? Sound crazy? Who cares!
It's all about YOU taking control and not the adrenaline.
What do you think? Am I crazy enough to understand? I've beat this thing and so can you!
I'll be around today and some of tomorrow if you have any concerns or questions.