Sorry is Lamictal an antidepressant or mood stabilizer?
I'm on one anti depressant and one mood stabilizer, with no side effects fortunately

but not lamictal, so I can't really tell you whether lamictal works or not. Sometimes these medications are a mix and match, as in how well it works varies from person to person. Some people are lucky in the sense that their first trial with medication works. For some, they would have to change their medication to a more suitable one.
I would greatly encourage you to see a psychiatrist, since you say you have mood swings.