I like your description of it as an excursion into folly. I’m still having therapy and there feels to be something of a folly about the whole thing, though it has some benefit. I never experienced distortion or hallucination, though one time I convinced myself that a T had said something that I realised in talking to her the next time that she hadn’t said (the T actually said that she must have said it if I thought she did, but, scarily I came to the conclusion that she really hadn’t and I had created it in my mind).