Wow, I would have been totally freaked out by that as well. I'm sorry that happened. I wish you could have told her how uncomfortable and 'off' that felt to you and how much pain it caused, but I probably wouldn't have been able to do that either--I'd have just bolted.

Anyway, it makes sense this would come up during massage. Can you talk to your alter and assure her you are watching out for her safety now? Or maybe, if that isn't enough, maybe a different therapist could get this resolved with a small amount of work.

It really shows how far you've come that you have this all in conscious awareness and can talk about it. So many DID people don't!

Good luck to you!