Back then when I had a panic attack and started experiencing heavy DP/DR, I was reading articles about it constantly. All my mind remembers that through all of those sites is articles saying "DP is not harmful", "panic attacks are not harmful", "you are not going mad".
So my first advice to people who have a huge fear of going mad, take time to investigate if it's actually happening.
These symptoms aren't coming from thin air. Of course, I am not trying to say that every single person with DPD is in the process of going mad, but it was definetely the case in my life.
When I was convincing myself that I am actually doing something with my DP problem, what I really was doing is reading all the "calming", there-is-no-problem-with-you articles about DP.
I lied to myself that all of these terrible symptoms, insomnia, panic attacks, fear of going crazy were actually there for nothing. I successfully believed this lie, and as I got used to the feelings and symptoms, I allowed myself to stay on a path of going insane.
I of course, never became insane in the way that I started hallucinating or thinking that I am an alien, I don't think convincing yourself and people around you (and on Facebook!!) that my father who always loved me and still does, is actually a narcissist or psychopath is any less insane than the other examples.
DP / DR means you are drifting away from reality socially. This is a WARNING SIGN. If you are scared to death, you are probably intelligent enough to feel that something is quiet off. But as long as you are scared, that I think also means that there is hope.
As long as you are scared that a lion will eat you, you are probably still alive. But that time is not to be spent on thinking about your DP disorder, but to completely forget about it and immediately start looking for the reason. The reason, which has ZERO to do with any symptom, but to a HUGE problem in how you operate as a person.
Do not be scared to get help, and do not ever give up and do not let your recovery steps slow down until you KNOW, and FEEL how and what has caused your DP. You need to build SOLID and GROUNDED self which is not being shaken by anything or anyone.
Do not be like me. Wish you the best.