Buspar is crap, it gave me a headache and did zero for my anxiety. It sounds like others felt it was also about as effective as nothing. Benzos are always going to work the best, I have not been able to find anything else that works. Every time I get a new doctor they try and take me off my Klonopin, I let the lower the dose and within a few visits, we have it right back to where we started.

Unless I missed it I am surprised I didn't see Cymbalta on your list of things you have tried. It is the antidepressant for anxiety, even officially approved to be used as a treatment for GAD. Unfortunately, I had side effects from Cymbalta so it didn't work for me but I would absolutely ask about it. I have a friend who is on it and it worked amazingly for her.