Another thing that might work is to have your therapist catch you before you get too deep. My therapist can usually tell what I'm starting to dissociate in hell I stop and say how present are you and if I'm just starting to go down the hole he'll do grounding exercises to bring me back before I get too deep into it doesn't stop it from happening but makes it easier to come back. Then again when we're talking about stressful things I can go all the way quickly too.