@Anonymous: My annoyance at this not being ITR was cancelled out by "I know, right?" Unhealthy or not, not having a period was awesome.
@Anonymous: I find this question a bit confusing. As I understand it these are different phenomenon. So uh...address the one that applies. If you're asking how to tell the difference, it's hard to answer without specifics. I have a friend who goes from hobby to hobby and makes dumb sexual decisions despite wanting a relationship because he fears being alone and has a pathological lack of his own identity aside from anyone else. Maybe that's filling a hole. The other one would be, what, a pattern of behavior with no clear motivation?
I'd say both are equally bad to be around.