I had a similar experience. When I first started seeing my T, I had no childhood memories from the time I was 6 yo til I was 19 yo so definitely trauma there. It all unfolded from my memory in bits and pieces over time (about 4 years) with T walking me through dreams I remembered, smells that triggered memories, photographs, a man that scared me in a crowd (a perfect stranger), etc. He never put any words into my mouth or led me in any way, just let me speak whatever was on my mind or whatever associations came up. And little by little, a lot of the memories were restored.
There are still big chunks of my childhood that remain a mystery that I'll probably never remember. But the weight of those hidden memories and feelings is gone, so I'm pretty sure we've uncovered everything.
Give yourself time - it will happen - don't try to force it. Maybe start writing things down - little bits and pieces may not make sense now but may connect together later on. That's what I did and it definitely helped. Good luck