If you feel like you've made progress with 4 things out of 5, then I don't see how this is a failure only because there is one thing left that is more difficult for you to work through than others. I am not telling you how to feel. I am just saying that your perception of your lack of progress contradicts the reality. Working successfully 4 things out of 5 is a progress, not a failure. If you feel you are not capable of continuing the work and that the fear that still remains is too big for you to tackle at the moment, it's ok to take a break and give yourself some time to decide what to do next. As others said, therapy is not the only way to work on anxiety. Frankly, if all you need is just to learn how to manage it, there is plenty of free online resources you can use. There are also alternatives like acupuncture, herbs, massage, yoga, so you can search for alternative practitioners in your area. It's ok to stop at the moment any way you want. You can either call your T or email her and explain why you are stopping or you don't have to say anything, just inform her that you need a break and that you'll let her know when you are ready to resume therapy. The final decision is always yours. Do whatever feels right for you at the moment and do not concern yourself with how your T will take it. She should be okay with whatever you decide.