I've spoken on the phone to two therapists who do specialize in therapy ruptures or impasses. The first made things worse, the second was supportive but not particularly helpful. With the several other Ts that I talked to in person, it was much the same.

The traumatic therapy experience was, to many of them, just a reflection of old wounds; it didn't actually happen the way I thought it did, or it didnt much matter. All of this was sort of abuse-like, almost a classic blame the victim scenario.

From my experiences, I'd caution any client with a story of harm in therapy to tread carefully with future Ts. Some may come after you (like one guy did), others might invalidate more subtly.