When I first started therapy I would numb, laugh about my trauma, talk about it like it was nothing. These days I cry at the words in a song, when I am journalling, occassionally in therapy, but I can feel in therapy, and give myself permission to just sit with the emotions.
I did dialoging with the non-dominate hand journaling to stimulate the emotional side of my brain which was shut down, and after several months all these emotions were pouring out of me. It took years before I could stop dissociating in therapy, and stop numbing and fearing my therapist, because of all the things I told myself.
It takes trust, with yourself and your therapist, giving yourself permission to accept your emotions and to stop fearing. Fear, is False Emotions Appearing Real, all those things you tell yourself are they really true? It cost me a huge amount of wasted sessions, lost time and money I can never get back. I told myself if I would feel what I was feeling I would shatter into a million pieces, so I shut it down, if I cried I would look stupid in front of my therapist (like they have never seen someone cry), the emotions come and go, they don't last forever. I did not drown, I did not die, I had survived and I will survive each time I give myself permission to feel. Talking without experiencing it with emotions, held me back.
I had to give myself permission in private, I know this sounds stupid but it worked for me. I practised at home, I printed my therapist photo and would talk to it like he was really there, and the tears would flow and I got used to the idea of looking at him while experiencing all the emotions. After a while I could really just stop fearing what I was feeling, and being afraid of being judged, when I was in the room with the therapist. Acceptance of emotions, of yourself, of your therapist is the key. Not easy but it is possible, you just have to give yourself permission to feel what you feel, start small.
Listen to the things you tell yourself, are they true, are they really true?