Don't beat yourself up, you couldn't know the effect it would have. I think a lot of us would like to get off of medications (or some of them) when we're feeling relatively well.

Can you go back on it? Do you have any left from before? Can you call your pdoc to fax over a script to your pharmacy asap?

I -and I think many here- have found Lamictal to be very effective; you're not alone in having had success with it. I hope you're able to get back on it as soon as possible. And, again, don't beat yourself up, you made the best decision you could at the time.