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Cary's advice is excellent.
There MUST be a city or county health clinic or public hospital available to you. Go there. See an MD and request a prescription for an antidepressant. Zoloft has worked wonders for chronically depressed friends. Yes, it's $1 a day, but that's cheap for the relief it (or another SSRI) brings.
Once you are on more solid emotional ground, then you can proceed to understanding how you got where you are, and how not to be there from now on.