Back when i could dowse (a few weeks ago)i was getting that there was a difference between 'shadow self's' and non-self malevolent spirit entities. but as i understood it, they are so related and similiar in symptomatic's, that there is generally alot of confusion and identification between which is which. when i was working with my shaman, the distinction was made between wetico, and a shadow self stemming from when i was three. and according to her communications with spirit the shadow self was actually the bigger problem, and wetico loves my ass..
find the shadow self to be a very interesting concept too, would have poo-pooed it as likely bs awile back but would have probably thought the same for soul-loss which i know is real thing now.