Book,
This might be a state-specific thing that only Tennesseans can help with....any out there? Are there local attorneys or women's groups or helping organizations that will -- while not handling a divorce -- counsel you on the possibilities?
Taking a semester or two off school to straighten out your life and free yourself from a destructive addict and this dependent situation is not a dishonorable thing. I'm sure you don't want to do it, but it will not be the end of the world.
Hugs,
GL