OP, I am so sorry to hear this. I often recommend therapy to people especially when they are dealing with childhood trauma but, and this is a big BUT, there are truly a lot of therapists out there that are not adequately equipped to deal with it properly. To be fair to this therapist though, if you did not say, "I need to stop, this is too painful and is fueling my addiction" he/she would have no way of knowing the problem. Developing a relationship of complete trust is essential to any therapeutic treatment.
I am a big believer in facing pain. That is partially due to my own history of running from it (and never escaping); followed by my experience of healing once I determined to go back into it and rewrite the story in my own head for myself of how it was going to affect my present life. But I am not so arrogant as to assume that I know what this process is like for victims of childhood abuse. I do believe that is a category of pain I can only understand intellectually.
For me mindfulness was very useful. Just this one tenet: is the trauma happening now? No, it happened in the past but it is still affecting me now. So, right now, do you need to feel afraid or uncomfortable? No. It is impossible to describe how freeing this was for me once I was able to actually use it. I guess a better way to describe that would be to say it went from being an intellectual exercise to being an actual voice of my own that countered my life-long voice of panic. Panic and anxiety used to rule my head. The difference now is that there is a calming and rational voice that steps up to challenge the fight or flight brain.
I think that as long as you are dealing with this addiction you need to protect yourself. But it is a bit of a tangle because there is no doubt in my mind that the trauma you suffered is also feeding that addiction on a very deep level. One of the things that childhood victims of abuse suffer from the most is trust. You had your trust in your fellow human beings obliterated. Those of us that have not experienced that can never really comprehend the enormity of that loss. But there are things that you can do to work on establishing trust without going back into the trauma directly. Nurture the relationships where trust does exist. Create a relationship of trust with yourself. Ask yourself gentle questions and sit with the answers before judging. If something feels wrong, explore it internally for a bit. Just giving yourself the space to be uncomfortable while still being safe is a powerful way to start.