Hi and welcome to PC! You'll find a lot of support and understanding here...you'll never be completely alone. There will always be someone here for you at some time.
I'm sorry that something happened to shatter the healing you'd seen. Are you back in therapy (if you ever left)?
If so, please stick with it. I'd say these parts of you that are so upset (whether it be scared, angry, distrusting, or all of the above) will respond in time and with patience.
It would appear that they ventured out into a "safer" environment and felt they could stay, then something blasted that sense of security and they all high-tailed it back to their "rooms"...
Just like the first time, it might take a lot of work to get them venturing back out again and talking about all that's "disabled" them, but I do think it can and will happen...especially considering the co-con you experienced before.
It might be that they need to see your world as "safe" again, and trust those in it again.
I could only suggest that you point all as much lovely and safe as you can...point out to your insiders anything comforting and enjoyable that you see and experience. That might be a start to getting the "doors" open in a safe, non-damaging way? It could also help you to try to put a focus there (on the present positive and safe).
Possibly you could talk with your therapist about that?
Keep talking. You're not alone.
KD