I am not a fan of the whole 12-step movement, it doesn't work for me, but the support could be awesome if you can find it and are ok with the whole "higher power" stuff (that's the whole reason I can't do it, too triggering).
There was another group I tried for the SI, I think it was SMART Recovery? It didn't click for me either, but something else to look into if you are still looking for other resources.