I am currently on Lithium 1200 mg. I take the four pills at night to get the 1200 mg, and I don't have any side effects. I feel pretty normal, and people don't notice any symptoms of bipolar disorder. However, I see that you have already tried lithium. Well not everyone responds the same to the same meds. Here are some other options:
I know someone on Lamictal, and it works great. Other mood stabalizers that have worked well with people are Depakote, and Tegretol. I would recommend finding a good mood stabalizer, and then whatever else you need for depression, anxiety, etc.