I think I'm getting better. I don't think of this as dp/dr anymore. That was making it worse. (Just checking the forum occasionally for any interesting bits and to see how other people are doing.)
So, if I am getting better there'd be two factors. I lost the terror in one go from riding it as far as it could take me, shut my eyes and tried to push it higher. I wrote that up in some other thread a bit afterwards. The second, and more important, was, um, reading the last few pages of Siddhartha by Hermann Hesse.
(I still don't feel like I did before. But I'm not scared, or apathetic about life, or anything negative really, except a little nostalgic for being 'normal.' But even that nostalgia is rather self-delusive I think, like misremembering childhood. I think if anything I'm probably happier than I was before. Not because of or despite anything, probably just because not a hormonal teenager anymore.
Anyway, my new way of thinking is to do with 'overlap,' a word that came automatically to mind after an experience of everything just clicking into place. I've stopped trying to avoid any particular way of thinking about things, that wasn't working for me, since everything I felt about things like self and reality seemed intellectually inevitable, and the feeling and the facts seemed inextricably knotted (maybe that last bit is where the illusion lay, but I couldn't get rid of it even if that's all it was). But then I've come to feel that it's possible to believe completely in the world at the same time as seeing right through it. I can't explain it very well but just read Siddhartha, the bit about stones.
I've had a lot of very interesting, pleasant and constructive experiences over the past couple of months. And I feel like I've got a goal now too, which is to make these experiences click into place with the real, normal world. And I know at the very least that I can't relapse into the state I was in before, because I've found a state that lies under the terror and believe in that more strongly than pretty much anything else. Even including stones actually.)