I think Lamictal works by minimizing the incidence of mood swings, kind of like a prophylaxis. I do not think it actually stabilizes mood like other MS can do. But hey, I may be wrong on this.

Any thoughts on this?

I do agree that this sounds like (hypo)mania to me. Since Lamictal can be activating, I can see where the med can be at least partially responsible for your state of mind.