Grounding afterwards is very important. Having your husband there for support sounds like a good idea. That's how they did it for SF's visit. As soon as she was in recovery they got me from the waiting room. Grasping my arm and touching my beard and another keepsake kept her from being too panicky.
I'd be happy to share more with your husband about our experience if you all would like.
It was a late afternoon appointment and she was mostly back to normal the next day other than several insiders were still hiding for several more days.
I think her reaction to the anesthesia was unusual. I don't think it was related to DID. Yet, having DID added a little extra complication to an averse reaction. Not something to worry about, but better to plan ahead for just in case. You know, like making sure the spare tire has air before a road trip, just in case.
Making sure the aftercare nurse has read the letter is important, but should really be done before the anesthesia. That's the biggest lesson we learned.