On a side note, does the binge and purge cycle count as self-mutilation?
Self-destruction? Yes definitely.
I think the difference with self-mutilation is that the aim (either concious or subconcious) is to gain the endorphin rush following from the pain response.
When I was bulimic I definitely didn't get an endorphin rush from purging but everyone's different.
Either way, they're both very destructive behaviours that can and should be substituted with more effective coping mechanisms.

You are a brave and strong woman!