Hello & Welcome, Bjorker! You're in a sticky situation; once upon a time I found myself in roughly similar circumstances, but not quite as threatening as what you're facing.

I have little experience with non-prescription drugs. Melatonin did not help my sleep problems. Try searching through the Drug Questions and Sleep Issues & Dream Interpretation forums. Also, depending on the severity of your sleep problems, you may be able to obtain significant relief without any medications through the practice of "sleep hygiene" techniques.

You have a lot at stake. I really wish you the best.