How seriously would the landlord take it if you decide to move out because conditions have become intolerable? It's like threatening to quit a job, it's a card you can only play once, but if he truly doesn't care, then that tells you he may be planning to sell soon or something along those lines, in which case you would be looking for a new place anyway. Instead of trying to fix where you are, I would try to go where you really want to be, if your job and finances allow you to do so. In any case, a lock on your bedroom door, asap! And I would take the cat to the shelter, and report him, but I'm a virtual b!tch. Just some ideas. Best of luck.