Have you considered how much your anxiety is related to your PTSD? I did over 4 years of CBT for GAD with limited results. I also have PTSD (and a PD) and I've found that CBT is often not very effective in treating deeper issues like trauma.

If you know you've put in the effort, don't let yourself be bullied into continuing CBT. Too many therapists oversell the modality and tend to blame client "laziness" when desired results are not achieved.