There are several different kinds of therapeutic approaches, but I wonder why DBT was recommended for you in the first place. It takes a very skilled therapist and group leader to guide one through DBT. There are a very support forums for DBT, particularly those that center around borderline personality disorder (since that is the primary diagnosis the approach is used for). I would encourage you to find another therapist if you feel like you're really struggling with the approach. Believe it or not, DBT takes a long, long time to master (years) and 8 months is barely scratching the surface. If you dig a bit deeper, you may discover that you actually ARE making progress, it's generally just done in baby steps.