It takes a long time to retrain our thoughts about ourselves, others or our life situations. Please look at the small successes and progresses and celebrate those. Don't discount all the work you have already put into it. Sometimes we just need to keep trying before we grasp the next branch we are reaching for. It may even take growing a bit taller in order to reach it. It takes time. Please be gentle and patient with yourself.

As for your symptoms of anxiety/panic, there are many new developments in therapy since CBT. Here is a good list of the many different types of therapies out there.

http://www.goodtherapy.org/types-of-therapy.html

Not saying that they have wide availability in regards to practitioners, but if CBT is not working for you, it is not you that is failing, the therapy is failing you. Find something that will work for you so you will be able to move forward, make progress, and begin to feel better about yourself. Good luck.