I have been in therapy for a long time. I myself think therapy as a way to keep myself functioning in the world. I never think im wasting my time in therapy and i do see myself making progress babysteps. For you it might be different. Maybe with your pdoc have a talk see if you can have a small goal to work towards or talk about your progress. I think it was a good start you ask him if you where wasting his time, i think that is progress in it self and something to examin further