Thanks all for your advice. I think I'm going to stop immediately with any more treatment and pretend I never had a diagnosis. I had already instructed the doctor to not inform my GP, so actually there's nothing on my record as far as I'm aware. Only thing now is that whenever I'm asked in future "have you ever been diagnosed with a psychological condition" I have to lie and say no
But in any case I can continue self-treating by exploring and researching the behaviour/condition. Just have to do it without a professional, which is a shame really.
Thanks!
Matt