I get what you're saying about levels. I think I was playing avoidance/distraction games for a long time because I didn't want to look under the layers too.
I do a lot of avoidance. It helps me to remember I am still "me" and that I've always been able to feel, but have not felt safe enough or had the resources to work with the really difficult things...so as I feel safe or get resources, a layer of avoidance or distraction or numbness falls away and it feels confusing and terrible, but I'm surviving.
interesting about trauma shutting down the language centres in the brain. That makes me feel a bit better! My therapist is very patient and never tries to push too hard - I used to find that a bit frustrating because I just wanted to get on with it and thought she was holding us back but, now I've experienced what doing some of the deeper work is like, I understand that she was just trying to ensure that it was manageable for me.
Sounds like you have a good therapist. With a former therapist I could talk about work or anything ho-hum, even bits of trauma from a detached position. But if I'm really going somewhere I have many moments where I can't talk. That's where I'm getting closer to trauma and the trick is to not go there 100% (brain scans of people reliving their trauma shows a shutdown in the left brain and parts of the frontal cortext)...so in therapy we're working on finding the edge of the trauma but also staying present. Just talking through it doesn't work in most cases because we're at too much of a distance. So, when it's hard for you to talk and feels like you might be far away in terms of moving in the right direction, you might actually be getting closer. But great if your therapist can keep it slow so you can talk or respond a little bit...or find the words soon after. That's sort of how it's been going for me.