These are both symptoms, which affect the way you experience yourself. Derealisation is the sensation that you and everything around you is not real or dreamy, as if you are seeing everything through a fog or some kind of filter. It has been noticed that people experience both depersonalisation and derealisation during panic. It seems that some people dissociate first which then causes panic and derealisation.
It is not important to try and understand the physiology of the human body but it is important to remember that every symptom you experience can be explained. Do not dwell on what you are feeling, instead, project yourself into more useful subjects, do something constructive, exercise, learn a skill or craft and escape the body trap.
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