By Instantanious I mean that it may not have the results today, or even tomorrow, but may well kick in the day after, for example.
Did he encourage you to listen to a CD at all? Your brain believes what ever you tell it. If you come out saying that it was crap and it wouldnt work for you, then you'll probably believe it.
Did you feel comfortable with him? Did he make the effort to build up a rapport with you?
If you really feel it didnt work, then maybe you need to contact him and explain to him.