Welcome, womanundertheinfluence (gods, what a long name!

)
To be honest, you sound like you're in a really bad spot. I'm not sure what your doctor diagnosed you with, but if you've stoped taking the lithium without consulting a doctor, I would highly recommend you see a new doctor as soon as possible.
Whether it is depression or bipolar (or anything else) is quite frankly irrellevant - you need help! Feeling this down isn't right, and it completely clouds your judgement.
Please, see a doctor ASAP and get some professional advice on what to do.

Hircon