Lamictal hasn't helped me with anxiety AT ALL, and I have a diagnosis of GAD as well as BP. Usually other meds are used in conjunction with Lamictal to help with anxiety or acute manic episodes (since Lamictal is good for depression but ehhh with mania and anxiety). I was put on Risperdal for that purpose, but I had a billion side effects which were worse than the anxiety itself, so I stopped taking it. Does the valium help? I've heard that for a lot of people, it kinda makes you feel numb...and if you're thinking that you're getting dependent, I don't blame you for wanting to quit it. There are some alternatives, though...Klonopin is supposed to help, also Buspar and others. I'm not a doctor but y'know, being bipolar, you constantly have to be aware and you gotta know what options are available to you.

Your doctor probably doesn't want to take you off it because, like most doctors, they only care about fixing the problem that they treat. But if you're really concerned, MAKE them listen to you and find you an alternative...they'd rather switch you to something else than have you stop taking meds altogether.