I have been on Lithium for about 3 and a half years. During that time I have been going to college and am about to graduate this spring. I remember when I first started lithium I was really tired at all the time. However, I don't know if it was the lithium or the abilify that I was on. Anyway, the tiredness has gone away and I don't have any side effects. Although I know that everyone's body is different with reaction to the meds.
Some other mood stabalizers that people have done well on are Lamictal, Depakote, and Tegretol. I would talk to your doctor about different options in regard to mood stablizers.