This seems like a simple story but it is really complex. The kind of image distortion experienced by the narrator is actually a psychological syndrome. Usually the disorder is not treated so easily as to tell someone their appearance is normal. In the story, fortunately, the narrator is easily convinced.
You describe the narrator's discomfort very well so that we feel his distress. Good character arc.
Thank you for sharing this story with us. We appreciate that you engage with other writers.