I did quite a bit of ACT in residential treatment and intensive outpatient. I think it's incredibly helpful for anxiety and DP/DR. You really cannot talk your way out of DP/DR, you need to get out and live life, and ACT is all about getting out of your head and the endless swirl of thoughts. I highly recommend it. There are also some good workbooks on Amazon, although I found it was really useful to have a therapist keeping me accountable. Not sure I could have just done ACT on my own. Good luck!