Hi Hopeful,
Please don't feel bad! I identify with your situation completely. Since I was 20 I've had 3 bad episodes of agoraphobia, recovered, and relapsed each time. I'm in the middle of a relapse right now. It doesn't matter how well you know your CBT and your exposure therapy theory and all that - you can still experience agoraphobia. If cure was easy, I guess we'd all be cured. Let me tell you how much I identify with your problem - only 20 minutes ago I was sitting at the end of our block, waiting for panic to subside, just waiting - that's the furthest I can drive! Eight months ago, I could drive wherever I wanted.
But - four months ago I couldn't even drive a couple of metres. So you see, things have improved. Sometimes, it just takes absolutely ages.
Based on my experiences, here's what I think might be helpful to you, even though of course it might not be:
- First of all, I think by forcing yourself to keep driving back into the place where you had a panic attack, you had the right idea, but you were 'flooding' instead of doing proper exposure. This is what I think works: Say you had a panic attack on the corner of your street. It doesn't work to force yourself to go to the corner, have a panic attack, and then quickly walk on. What you have to do is go as far as you can without having a full blown panic attack, and stay there for ages - like 20-60 minutes. You keep advancing til you can stay in the spot of your previous panic attack for 20-60 minutes without having a panic attack. Flooding and fleeing doesn't seem to work, for me anyway.
- I think you are right about the effect of your medication wearing down. That's okay though - I think you could recover without any medication at all, if you are willing to practise extremely boring exposure sessions every day, as mentioned above. Also make sure that you give yourself a good chance by definitely cutting out caffeine altogether: no tea, coffee, cocoa, energy drinks, colas, caffeinated soft drinks, etc. No street drugs. No alcohol. Then if you can handle it, cut out sugar too. And get at least 20 minutes aerobic exercise each day. Then your body will be in a relaxed state.