If I were in your position I would stop seeing him with or without a new T. Your sessions are essentially useless and making you frustrated on top of your existing issues. It's a complete waste of your money and time. It's not necessary for you to tell him or schedule a final session if you do decide to drop him, but if you do, I would tell him how ineffective he is. If not, then if he is part of a practice or clinic I would tell the director.