Maybe you should talk to your pdoc about a medicine adjustment. I always feel a little bit tired from meds but not totally wiped out. I took up to 1800 mgs of lithium for years, but since I've been reduced down to 600 mgs of lithium and 150 mgs of lamictal, I have more energy and I lost weight, too. You can have a happy medium, you just have to let your doctor know what's not working for you and what is. You'll get there!