Switching to Lemectal

I was on Dilantin for 20 something years and I had a seizure. Doctor switched me to Trileptal. It was working. But it depletes my sodium. And no doctor wants to prescribe me sodium meds. Now he's switching me to Lamictal. I got to increase the dosages every two weeks. And then he can get me off the trileptal. Supposedly you will not call will not deplete my sodium. But it's making me sick. Massive headache cuz three in the morning. Sick to my stomach if I move around too much. I can't even leave the house without great difficulty.