There is some research suggesting that this kind of catharsis is downright dangerous and only deepens wounds.

All talk therapy is improvised, as evidenced by your therapist jumping from method to method. So it's russian roulette, even though they talk a good game about evidence-based methods. There is absolutely no way any therapist can predict how you will respond to drilling down on painful experiences over and over, and just because they have done this with other people does not necessarily mean anything whatsoever for a given client, since we are not machines. Again, russian roulette is the game, in my experience.

I was traumatized in various ways as well. What helped me was to get away from therapy, and network with others who were made worse by therapy. I had to escape the incessant drumbeat of "more therapy, more therapy" and get some psychological distance, so I could unravel things, and hear from people who were not in the grip of it.