This episode kind of reminded my of the short story "The Overcoat" by Nikolai Gogol. As the audience, I sympathize with the protagonist and it feels like his pains are my pains. At the same time he is undeniably strange and disturbed. I've been a huge fan of the show for some time but I'd never seen this episode until recently!
I love the music to this episode also. I think the violin parts to the Twilight Zone theme (and the variations) are so creepy. The music just adds to the eeriness. I don't want to give the plot away, but I definitely recommend seeing this one!