I can really relate to this and I'm impressed how accurately you can describe depression. I know that I would never be able to verbalise this as you have.
My favourite part of this is:
These words become familiar and comforting, a cold blanket that soothes your warm body to numbness.
My mind was like this for at least a year of my life and the repetition of words numbed me to the point I could feel my heartbeat slow. This is a something that I feel would really help those who can't relate to depression get a good idea or understanding of just what it's like.
Sophie.x