What are your experiences with lithium? Like it? Hate it? Side effects?

I’m tapering off lamotrigine in favor of lithium because the word recall was so terrible that it was getting in the way of my job (I’m a copywriter). 

I like how stable I feel, but I have noticed I’m drowsy all the time. It’s hard for me to concentrate and I daze off a lot. I have ADHD so this is already a problem. None of the other symptoms are that severe for me.

Do the side effects go away with time? 

What are your general opinions/thoughts?