Depersonalization and Self Infliction:

I've added some Self Infliction links here 
along with DP/DR links, as sometimes a person
with DP/DR has the SI components that is first
more "tangible" upon discovery.

Excellent personal description with extensive information
http://www.dreamchild.net/

Diagnoses associated with Self Infliction/Depersonalization... 
scroll down to read it all.
http://www.palace.net/~llama/psych/diag.html 

Mount Sinai DP explanation.
http://www.mssm.edu/psychiatry/ddrp.shtml

Tomography study of DP. Interesting!
http://ajp.psychiatryonline.org/cgi/content/abstract/157/11/1782 

Self injury
http://www.palace.net/~llama/psych/injury.html