Indeed Keeper, but the honor is all mine.
At first I thought you were referring to curing a person suffering from a telepathic attack, which is far more common ailment than what you describe.
The merging of two souls, a human and a spirit, inside a single body is one of the toughest challenges the Church has taken upon Herself to solve. The Master Teacher is the one who successfully accomplished such feat after decades of pain, chemical experimentation and endurance.
Fortunately your case is quite different. Based on your description the consciousness that resides within your mind is small, weak and broken. It does not possess thoughts or perception, it is only guided by its primal instincts, one of them being of course self-preservation. Furthermore, you seek to remove that consciousness instead of seeking to unite with it into a single body which is a far more difficult task as previously explained.
I am able to perform this operation by ending the consciousness' torment and suffering while also curing your mind in the process. Of course this is not a routine operation and I cannot beforehand promise you success. Also you will have to find me in The Shrine which due to its positive psychic properties as well as its vast distance from our galaxy and the Mindshare will ease the process and increase our chances of success.
As for the Vagrants, I cannot know if they have knowledge on your condition, and if so, the willingness to help you. While their knowledge and wisdom cannot be compared with the primary Mindshare, I have the outmost respect and admiration for their community.