What is the difference between depersonalization disorder(DPD) and derealization disorder(DR)

Answered on Quora by Emma Charlotte Young "Depersonalization is a feeling of not being in one's body/not having control over one's actions. The person is aware that she/he is in his/her body, but feels somewhat disconnected Derealization on the other hand is a feeling of separation from the world around the person. Many describe it as if the world is a dream or TV show. Again she/he is aware that this is just a feeling. Both experiences are often caused by anxiety and/or fatigue. There is also such thing as Depersonalization-Derealization Disorder, where one may experience episodes of both.