There have been a couple of posters who left therapists they were attached to by first finding another therapist and trying them out before leaving the first one for good. In one case, I think she took a break and tried out another therapist for about 2 months and then was able to end things with the first one after that time. So maybe that's one option for you is to try out others while you take a break from this one; then, if you find one that works better for you, it will be a bit easier to leave (although, I'm not sure it's ever easy if you're attached).