I have been taking Lithium for more than 1 1/2 yrs over the last 2 years (I was off of it for a few months). I have been taking it at a fairly low dose of 900mg. The only times I felt sick were when I was at a higher dose, or switching between brands. My usual level is at 1.1, but the most recent level reading was 1.7. I have been feeling really sick from it. I have had stomach cramps, nausea, headaches, and slight dizziness. I have been talking to my pdoc, and I lowered my dose to try to get things to calm down. We still don't know why my level has shot up. I was just curious, if anyone else has been through this.