I don't remember anything from lithium (first bipolar med 13 years ago) beyond everything feeling really bad, not feeling in control at all, and gaining massive amounts of weight after it killed my thyroid. This was in the span of a few months. About ninety pounds. The clarity didn't come back until 3 different meds later and a much better pdoc decided to check my thyroid hormones and got me on meds for that.
You are getting regular full panel blood tests?