It really does suck to feel stuck in a job you hate. You spend so much of your day there, it's sometimes hard to recover from it. But, until you find some other solution, it is the reality. It sounds like you need to put some emotional distance between you and work. Just keep in mind that it's not where you want to be or what you want to do, and that you can work toward changing your reality. And after you do get that writing course under your belt, or find something else, all those *****es and assholes will still be in the same job, doing the same thing, while you've moved on to bigger and better things.

So, what can you do to move closer to your goals? Do you need to register for that course? Do you need to put some money into savings to get a new place? What can you do in the meantime to stimulate your brain and feel alive again? You need to feed your soul. And, increasing your Prozac may be helpful - it's worth talking to your pdoc about. But even then I think you still need to adopt a "work to live" attitude and just understand that for now it's just a job to earn money so you can do what you want to do.