Hi Jean,
Have you communicate with this spirit ? or find a shaman to get rid of it? i had similar problem in the past but luckly met a (shaman) or wise person whom removed it from my spine.
(well at least it felt that way). reiki as far as i know doesn't work for their kind. or need different technique to do it. earth energy and local deva should be asked for permission for using earth energy and help to remove the entities. i'm still beginning to understand some of this so i can't really help you yet on specific procedure.
wisdom be with you
liam
