I know we hear this over and over but it's so true. Some meds suit one and not the other person.

I had awful lack of energy on Lithium but switched to Tegretol and doing much much better. I had some problems with forgetting words for the first couple of weeks but thats settled down now, I'm still a bit hyper moody and agitated but hoping that settles too.

Give it time ( until you really can't stand the side effects anymore ) then consider a switch