First, I would like to welcome you to the HW forums.
I was on lamictal as a mood stabilizer/anti-depressant for over a 1 1/2 years in the past. I barely had any side effects when I was on it, but everyone is different. I don't do well on SSRIs, but lamictal really lifted my depression, it was the best I fealt in a long time.
I quit taking it because after 1 1/2 years of being on it, it quit working for my depression. That is the only downside of lamictal. The $$ of lamictal depends how much your dose is, and if you have insurance or not. I didn't have insurance, so it was very $$$$ expensive for me to get a month supply. I hope this answers some of your questions.