I've been taking Lithium for four years (BP1) and I've been taking 900mg. daily which is the therapeutic level. I would make a guess because you have only been taking it for 2 weeks perhaps your Doctor thought you were just a little more than hypomanic and is trying to decrease your dopamine level at a more rapid rate in order to balance you. Most likely he /she will lower the dose soon. Lithium makes me slightly tired or daydream-like, so I tend to take it in the evening when mania seems to be at its highest level; it appears that depression is at its lowest level during our depressions in the morning. Hang in there.