Lamictal makes me tired and sick. I'm on Lithium as well. Lithium has always helped me.
Weight gain should really be the least of your worries with bipolar. The medications I'm taking me that have caused me to gain weight have saved me from my own hand.
25mg 2 weeks
50 mg 2 weeks
100 mg 2 weeks
200 mg 2 weeks
400 mg 2 weeks (split)
Here's how we'll go forward.