Lexicon,
You need to talk to group facilitator about this. Having a major trigger in group does not seem very safe to me. The t who runs the group should be able to ask court to get you to a different group.

Make sure they know what is going on. I would do this in private before the next group if possible. If you do not feel safe in group then I would think it would be of little value to you.

Good luck and take care.