I have had this happen to me more times than I can count. What we really need to normalize is that there are shitty therapists out there. And in my experience? Most therapists don't have the toolset, skills, training or capacity to address PTSD and trauma. Mine has an extra layer (multiple extra layers) that run of the mill folks are also not typically trained to handle, so the bulk of my therapy has been conducted by Weemie's Truly. Myself, yeah.
I had the good fortune to be placed in a program as a kid that was effective at treating kids like me, and targeted toward me specifically (even if I didn't feel it at the time) but as an adult, spit out onto the street and left to pick up the pieces? Yeah, it's been hard. Having felt the good I have no tolerance for clinical incompetence.
These days I've hit it off with a good couple of therapists who get it. One was in Rwanda. One is a forensic psychologist. I felt more stable talking to them because they had the experience of speaking to people like me before. It didn't phase them. B, the guy who did outreach in Rwanda, said you aren't the first kid I've sat across from. You're not a psychopath. You're not a monster. I feel safe in this room with you. Made a huge f*ckin' difference because he just got it. Fundamentally got it.
Is he as well-educated as K? No. But that's irrelevant. I can teach him the therapeutic modalities that work for me, and I have been. And we're working at it. And he's teaching me, too, through his psychodynamic 50s stuff. In particular that Karpman drama triangle helped me out a lot in realizing that we tend to vacillate between victim, rescuer and perpetrator.
But all that being said, therapists are a crack shot. Some of the least educated therapists might be the most helpful. Some of the most educated therapists might be full of shit. The most important predictor is experience and validation in my opinion. A therapist who respects boundaries, who allows me to direct the sessions as I need, who will work with me where I am. That's invaluable. But it's rare. It takes a long time to learn what "works."
As for peer support, I'm a big proponent of this. Peer support was vital at Romeo Dallaire. We would break off into groups and really get into the grit of things, amongst those of us who just "got it." And that helps on the communal level as well because you build a community with the people around you. Even in this space, you have your community constitution. And that stuff is important. Anyhow, I think I've blabbled all I can blabble! So. :>
The gist of it is, therapy takes time. Getting a good therapist takes time. Learning what good therapy is takes time. You will get there. You will.