I agree with everything koru_kiwi has said.

I am still suffering from retrauma from my long-term therapist and my experience in therapy was largely life-altering in the way described (often destabilizing to a point of not being able to work).

At a minimum, I would consult with one or more different therapists. There’s a tolerance threshold one needs to have to get through tough emotions, but there is a clear point where clients are being harmed vs helped and an exit plan is required.

Hugs and hopes for healing!