It usually takes some time to get used to a T and to see/feel improvement. Sometimes you can feel even more bad because you are talking about all the stuff that's been bothering you.
I've started therapy again over a year ago. And there wasn't really improvement for months. I felt so hopeless. I was in a really bad/low state. I had thought about quiting. I even searched google to see if I could find a T that might could help me. But I stayed with my T. I liked her a lot and she understands most of what I tell her. But at that time I doubted if she could help me. I thought I might be a too hard case for her.

Maybe you can talk to her about your concerns? Thought I didn't tell my T this.
If you really think it won't work, then it's better to quit. I've stayed too long with some T's. I thought it was me. I thought I couldn't be helped. But it can also be the T. T's don't know everything. They don't understand every client they see. They don't know about all the mental diseases that are there

But if they won't help you with finding a new T, can't you look for one yourself? Google what T's there are near you? Or ask your doctor/gp for a referal?