Since you ran out of Lithium and don't have an appointment, you could call, make an appointment and in the mean time they will call in a script. Lithium is wicked cheap and it is one of the best meds out there for bipolar.

Also most doctors will give you samples, not for the Lithium as it is an old med, but for others. The drug reps always give the drs samples. I have gotten months worth in the past.