Inner eldritch
When someone feels like an eldritch incomprehensible being inside a mortal body. This phenomenon is most common amongst autistic or otherwise neurodivergent individuals, but can apply to everyone who gets the feeling.
A: You know, sometimes I feel like an incomprehensible cosmic horror in a mortal body, I call it inner eldritch.
B: Yeah, I can kinda relate to that.
B: Yeah, I can kinda relate to that.