Part of this post has been written as a reply to Faded White Brain....but I would like to share it with all. I'm writing from my own experience.
I don't call it an illness any more. It's a state to me. I've had it for approx. 8 years now. First was getting crazy not knowing what's wrong with me. Later, after I found out, was getting even crazier for not having a cure.
But, however horrible you all feel now I want to tell you that it can get better and it will.
Depersonalization and derealization are usually , if not always, symptoms of underlying trauma. It is a protective mechanism because your system is overloaded.
I was in hell because of it, but now it loosened up because I started solving underlying issues.
What helped me a lot was osteopathy. I was lucky to find very good practitioner(this is very important).
As most of us think trauma affects our mind only, brings us bad memories, that's only part of the truth. Trauma , conscious and unconscious, is stored in our body causing energy blockages. One might consider herself less traumatized than other , but nothing can really determine whose trauma is bigger. One went though strong abuse, other fell of bicycle while a child, and both can have severe trauma or not. It really depends on person.
Osteopath removed some blockages and the energy started to flow. I can't thank enough for that. I get new blockages , of course, because I'm still working on my anxiety and anger ( I have a lot of suppressed anger that comes out now).But that time , when after many years I felt alive again is precious. It started to get better.
Some of trauma we carry has been passed through our ancestors. I know it sound unfair, but it has. Not always , of course. I'm currently in therapy that combats that, as well. All emotions once suppressed or overwelming must consciously pass through the body.
I'm not an expert , just writing from my own experience, but I would really recommend you to work with your body. Massages and acupuncture are good as well.But my symptoms returned very quickly after them, though.I felt well for 2-3 weeks after.Was told to continue but it was to costly for me, unfortunately. Osteopathy help for longer and still does.
And therapy for underlying problems.
I would recommend you to check Peter A.Levine. One of the best in trauma field. Inventor of somatic experiencing therapy.
I would like you to consider that sometimes depersonalization happens when individual is going through spiritual awakening. I'm not talking about state recognized in Buddhism- that's something else, just the same name. But still , if there is no trauma ( and karma) , awakening goes rather smooth. It might sound spooky for some, but there it is.
I also know that there are many people who have DP/DD after smoking weed. I tried that only once and was very dissociated till the end of the day. Next day was ok, but thought, to feel that horrible people must be stupid to smoke.Though, I will probably never know how proper trip feels like, I've been told a real one feels quite the opposite. In my case it was temporary DP/DD. It was around 3 years before DP/DD hit very strong and stayed.
I hope my post will help some of you.
I wish all of you to feel life again and simply be happy.