If you are a genuine individual and are serious: If it were only facial recognition, I would think it could have been a condition of prosopagnosia (face blindness) setting in. https://infogalactic.com/info/Prosopagnosia >"*A cognitive disorder of face perception where the ability to recognize familiar faces, including one's own face (self-recognition), is impaired, while other aspects of visual processing (e.g., object discrimination) and intellectual functioning (e.g., decision making) remain intact.*" However, you also noted the sense of impersonation simply by voice over phone and not only when face-to-face is involved. This leads me to think that it may not be (or only be) prosopagnosia, but Capgras delusion or possible a form of schizophrenia. https://infogalactic.com/info/Capgras_delusion >"*Capgras delusion is a psychiatric disorder in which a person holds a delusion that a friend, spouse, parent, or other close family member (or pet) has been replaced by an identical impostor.*" >... >"*The Capgras delusion is classified as a delusional misidentification syndrome, a class of delusional beliefs that involves the misidentification of people, places, or objects. It can occur in acute, transient, or chronic forms. Cases in which patients hold the belief that time has been "warped" or "substituted" have also been reported.*" >... >"*...patients with Capgras delusion may have a "mirror image" or double dissociation of prosopagnosia, in that their conscious ability to recognize faces was intact, but they might have damage to the system that produces the automatic emotional arousal to familiar faces. This might lead to the experience of recognizing someone while feeling something was not "quite right" about them.*" Also, if you're using drugs such as ketamine, whether for a separate condition or recreationally, you may want to stop: >"*In one isolated case, the Capgras delusion was temporarily induced in a healthy subject by the drug ketamine.*" Consider seeking help for it before it gets worse, especially if you develop toward also not recognizing your own reflection and seeing yourself as an impostor or that your mind is in someone else's body or that your body has been changed/replaced. Also, keep in mind that you may also get that sense from those who you would be seeking help from (such as a doctor in a followup visit seeming like an impersonator of the doctor from the first visit despite being the same doctor).