I know that people are very different in their sensitivity to Lithium.

I stopped yesterday because I was nauseated for the whole day, had a feeling of pricking in hands and feet) and had headache. So now I'm having my lithiumlevels controlled by a blood test. I'm only on 12 mg., haha, so maybe I'm just hypersensitive to it.

I probably could be caused by the mildly toxic level. Anyway, I'm hoping you'll feel better when you reduce the dosis.