i can be very obsessive about certain things... usually has to do with figuring things out...
and need to know things...
so i dont know if it plays a role... but i can see how maybe if you are so focused and concentrated on one thing for so long, so intensely, such as the existence and philosophical views of what i am and we are experiences.... might could lead to a deal of dp...

if you use any substances during these states then i think it can enhance the sensations... but this is just my experience you know... and i m just saying because i can be obsessive in certain ways, about specific things... since you mentioned obsession...
and that i have felt these kind of things my entire life.. even without and before i knew what substances was... so maybe an obsession on a specific thought can lead to a sense of depersonalization...

i have read that panic attacks can accompany with depersonalization as well, so maybe anxiety and dp can go together and doesnt make too big of a thing you know what i means...

i know that i have had severe attacks where conversion type symptoms come into play... and i end up with other severe symptoms for days or months afterwards like waiting for the tidal wave to recede...

how are you coping.,..? this is the important things... since these feelings can make you feel really crazy and bad... but they are really just feelings like when you feel funny about a string being crooked against the straight strings... wont kill you... but make you maybe feel dead...

if you come obsessive over the thought of hey im dead and im in hell and this is what i get for this and this, i totally can see it you knowS?

i know i live in a limbo type state... but its something i have been stuck in my entire life sense i never learned how to exit and feel normal, just have to try to look around and see things... notice things are solid... notice things are here... notice you are here... pull yourself down and try to pull into the body and feel that you are one with the body even if not feel like you are in the body...

clearly im not a professional so im just sayin.... i dont know how to control it but i think that if you can catch it before it gets way way far gone you can try to stay connected... like, notice that you are not there but notice you are not there at the same time and no that you ARE because you have to be to notice you are not... i dunno... i hate this stuff...

in another sense, in my understanding, depersonalization is when you seperate from the the body, not so much the mind... you are aware and conscious, but you feel that the body is outside of you, and that you are outside of the body, like something is wrong and it doesnt belong.... but i guess everyone can feels thes things at times... thats the part that drives me crazy... because im like... its not a problem... nothing is wrong... i am here... stop being weird... and things...

but what can you do... just talk to others i guess, if you seeing a therapist talk to thems... if you are not seeing a therapists then maybe consider seeing one because these things can really mess with your head atleast in my experience... especially when you start looking around and totaly dont feel in control at all and just seeing things in a strange cartoon way...