I've been giving a lot of thought to the small minority of chronic cases like yours. I'm no psychologist or neuroscientist, and I am not familiar with the current literature on DP/DR. (Most of my understanding is grounded in my own experience and reflections, but also the work of a couple of lesser known researchers in psychology whose (neglected) ideas I connected to DP/DR.) However, I am certain there is a solution, and that you will be freed from DP/DR. Probably within the next few years, and hopefully a lot sooner.
You've probably answered the following questions many times before. If there are any particular posts I should check out, let me know.
Does anything affect the intensity of your DP/DR? Or is it so constant that there is never the least detectable variation?
In all this time, has it ever passed for a brief time? (I recall Alterbridger mentioning that after a marathon EFT session, his DP/DR completely lifted for a minute.)
Do you ever feel much anxiety in everyday life? (Public speaking, interviews, that kind of thing.)
Do you live a relatively normal life (emotionally) aside from the perceptual disturbances of DP/DR and other physical health issues?
I eliminated 100% of my panic attacks & 99% of my anxiety 8 years ago (by quitting caffeine), but the DP/DR has remained 24/7 & is unaffected by this. That said, life is generally a lot better without panic attacks & anxiety as you can imagine.