I'm sorry this is happening to you. Would it be possible to ask your psychologist if they know of another DBT group you could join? Not necessarily one run by him but he could know of another one perhaps? I know how frustrating this sort of thing can be; I've been trying to get in to see a Pdoc for over a month now and they all have super long waiting lists (until like October). I don't know what to do and I just keep getting worse and worse.

Anyway, I hope you're able to get this sorted out. Good luck and take care!