I had to switch from my lamictal when I realized I was having an allergic reaction and my kidneys were shutting down. I was stable until I was out of work and in the ER several times. It's been a rough journey getting my new dosing right. At the end of the day you have to decide if being moody (for lack of a better word and understatement of the year) while you find a new medicine is better than the risks of lithium toxicity. For me, I didn't have a choice, but I would need my doctor's advice on my levels in your position.