Presumably in the past humans healed from trauma via tribal and community rituals, and through contact with the natural world. They didn't go to a stranger outside the circle and pay them for an artificial relationship that goes on for months or years.

Tribes and communities have broken down in the modern world, but still... therapy on paper looks like something that would compound distress not alleviate it, and seems like a horrible replacement. Just the basic arrangement of brief contact followed by void, what SE is struggling with, and which I found destabilizing also, looks like a train wreck waiting to happen. Plus the therapist's uncertain (or non-existent) investment in the relationship.

Some people have had luck healing with psychoactive plants/substances like ayahuasca and DMT. There are long-estbalished practices like meditation and fasting. Some people report profound changes with multi-day fasts. Not without risk but doesn't require buying into concepts like... you have a disorder and need to buy healing from an expensive pseudo-shaman. And there are support groups. Also, some people might feel "traumatized" because their brain is full of mercury or aluminum or parasites (for example) and no amount of talking is going to fix that.