Leave your stuff and GO!! It's only stuff! Take what you can carry and get out...then call the landlord, tell him what's going on....maybe he'll evict him and damages will be on him! You can always start over...and material things can always be replaced. Get away from this craziness. The sooner you do this, the sooner he will get help!! Right now you are helping him kill himself and putting yourself in jeperdy.
Take what you want and leave the rest!
NSW