It's frustrating to have to struggle to do stuff it seems like others have no problem with - going to work, staying there, being productive. It's confidence building though, to accomplish those things, I think. I'm glad for you that you're handling your anxiety, and frustrated along with you about the depression, malaise, difficulty w/ work.
Re Lamictal, just wanted to say that I was on 200mg for several months and greatly enjoyed it. However, when I got off and back on it again, my p doc made me use a starter pack again and gradually titrate back up to a dose theraputic to me. Whether or not starting at a higher dose would cause your current symptoms, I don't know, but it might be worth checking.
I wonder how others have started Lamictal - always very slowly or ? The main concern my pdoc had was avoiding any rash.
Keep taking care of yourself.