I think you should talk it over with the therapist, your lack of feeling like you have made progress and think about what you would like to "do" with a second therapist. Stopdog successfully uses two therapists but if you are worrying about what they will think and how you will feel, etc. it might be too much of a hassle for you at this time? Just hanging on to a therapist because you don't want to make the leap to another is probably not a good position to be working from? Either work hard to make whatever you want work with this one or try another or another type therapy, etc. is what I would recommend.

I employed two T's once, while my "main" was on an extended leave and made sure the second therapist was helping me with a project that I was not working on with my first, etc. but when my first came back, I told her what I had been doing/working on and she asked me to get rid of the second and I did. It all boils down to what you want and how comfortable you are working with one, two, more at once. It's your therapy.