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 
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