I'm so sorry.
I know this isn't really any consolation, but I know how truly awful and devastating that feeling is, and you're not alone.
I don't want to assume that I know exactly how you feel because it's different for everyone.
But I know that part of what made it harder for me was shame. I didn't want to tell anyone else because I felt like it said something bad about me. But this has happened to a lot of other people and it means that the therapist wasn't the right fit for you, not that there's anything wrong with you. If a therapist doesn't feel that they are qualified to help you or that someone else would be more helpful then it's their obligation to refer you out. My therapist compared it to a GP referring a patient out to a cardiologist if they had a heart condition because the GP knows they don't have the training and skills to help and there are people who are better qualified.

I know these words are easy to say but a lot harder to believe. And I know it hurts.
There are a lot of us here who know that feeling and you're not alone. Being able to talk about it on here with people who really understood and empathized and having that support didn't make it feel okay, but it helped me feel less ashamed and alone.
Hang in there.