You described a place of work that I like to call "Poison Hell", it poisons anyone that enters and turns something you love and yourself, into negative shadows of your formers selves.
You know you don't like, you know it won't change, you know you want to leave for something else but you're looking for us for advice.
The only advice we can really give is to not stay where you are, you hate it. Now, where to jump too... anywhere. Even if the other only lasts 2-3 years so what? that's 2-3 years you've not spent in hell having your soul sucked through the stab marks you'll eventually get in your back