Welcome!
I am glad so far the Lithium seems to be helping (ish). I am not on Lithium, but I have experienced the inability to convey my own life, just as you are, to others. It is like it is right there on the tip of my tongue! So frustrating.
I am and have been having very ambivalent thoughts about my gabapentin, like you are about lithium. I am not sure I want to stay on it, yet I am not sure if I have given it a proper chance to help me.
I guess I should take my own advice here, talk to the doc.....
I do not think you experiences and feelings about all these changes are uncommon, none of us like it either.