The opposite of a muse

What is the opposite of a muse?
What do you call someone who sucks all the inspiration and creativity out of your soul?
Or drains the soul right out of your body?
I need a word for what’s on my couch right now.
It’s been there for days, and I can’t rest. I can’t think. I can’t create.
I can’t write.
I keep trying, but the page is just as blank as when I pulled it out of my drawer.
I pour alphabet noodles across it. Scrabble tiles.
They slide off.
Without words, I have nothing to scream.
Only silence.