I have experienced a lot of weight gain since I started taking Lamictal a year-and-a-half ago. I'm glad I hear others have experienced the same thing, as I thought it was just from what I was eating. I have gained over 40 pounds since I started taking the medication.
I also understand that Zoloft (which I take as well), alone or in combination with other meds, can can cause you to sweat a lot. I have been sweating way more than normal in the last year (since I started the Zoloft). I thought it was due to the weight gain, but apparently it's the meds.
Oh, the joys of brain medicine!