I'd urge you to discuss your doubts with your T. I discussed my doubts in an emotion laden session a while ago (I couldn't seem to be calm about it), it helped. I treated the session as if it was my last one - I truly felt half way through that I would not come back, so said everything I wanted to, it was a hard session, but really helpful. I saw something recently that said 'be brutally honest' in therapy to get the most out of it.

I also might suggest to your T that they establish a room booking system at the clinic - what an unprofessional way to go about their clinic - with T's scrabbling for rooms when the client arrives?