There are many ways of knowing. A branch within philosophy, epistemology (theory of knowledge) is a discipline that deals with the question of knowing, and how it is that we as humans can come to "know things" about the world and ourselves, to put it simply. It is very easy for many of us who come from a well-educated background to only believe hard-facts, scientific studies based on "conclusive" findings. However, if you look at it from the branch of epistemology, a scientific way of knowing is not much different than a religious or spiritual way of knowing—in essence both require faith and both are belief systems at the core, never-mind the substantive component of these beliefs. In the latter you have faith in that a higher-being, a metaphysical force, a God is taking care of you and the universe around you, and you use this belief to explain certain things around you in your life, whereas in the former, you have faith in that a.) the scientific methodology is legitimate, that b.) the conclusions of scientists, researchers and scholars is valid and true (whatever these things really mean) and c.) faith in that those who are in the authority to teach us things about the world are indefinitely right. Many like to radicalise the two ways of thinking, one is usually thought of as the rational way, and the other is thought of as nonsensical by many of us today. However this polarisation is just an illusion, the receiver of either ways of knowing is subject to the same biological process in the brain when it comes down to that knowledge becoming stored in the mind and filed to enhance the way he/she sees the world.
Many of us with Depersonalization-Derealization Disorder (DPD) are trapped in the belief system that there is no way out, and that we have this condition forever because the scientific studies are inconclusive and they have not yet found "The Pill". I would like to refer you to the following (recently uploaded) video by Julian Cowan Hill who is a psychotherapist and tinnitus expert. In this video Dr. Hill introduces us to- and demonstrates to us the "No-Cure Model", and how this way of interpreting our experience is hindering our well-being and recovery. Julian Cowan Hill is a psychotherapist in London but primarily deals with patients who have tinnitus—a neurological condition—and he makes the sound argument that tinnitus is perpetuated by a loop of anxiety, more specifically the fear of permanence, the fear that you can never get better and that you will have this condition for the rest of you life. This unfounded belief system is what is thought to be perpetuating DPD as well as theorised in a 2003 study by Hunter et al. Many of us experience these symptoms, are terribly frightened by them initially, and then we come online only to find that "there is no cure", which falsely enforces the idea that there is no way out. Now, many of us have had this condition for years..."and I don't feel anxiety". It is the very veil of DPD, the very nature of this condition to mask and push-out of our conscious awareness the fears that we have been consumed by for so long (reference). I would encourage you to listen to what Dr. Hill has to say.
Let me finish off by saying that thoughts are dangerously confused with reality. Thinking that something is true, even being convinced by our internal compass that something is true, does not make the substance of that thought true. I encourage you to question your belief systems, I encourage you to rethink how you view this condition, and I wish you all the best for recovery. It is possible, many have come out of this condition, what is your evidence that you won't too?