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Start with getting a therapist. I know you don't have a lot of money to spare, so look begin by looking for free or sliding-scale options. Start by asking your doctor if he can recommend someone.
Meanwhile, to prepare for moving out, start reading ads - maybe start with ads on Craigslist for renting a room, so you'll begin to get a feel for how much money you might be needing.
At the same time, sit down and give some serious thought about what kind of work you could be doing outside the house. Meanwhile, make a point of spending some time outside the house every day - perhaps going for a walk, perhaps window-shopping, perhaps going to a movie.
Leave as soon as possible, and do not maintain contact. If I am repeating others, sorry, but that is the only thing that will truly help you. Your mother's problems are hers, and you need to begin to live your life for you. You cannot do this staying with her and letting her continue to cause you anxiety. Hugs and good luck.