Could it be the lamictal?

I have been on lamictal for several years (for BiPolar II). It seemed to be the perfect med for me and for a long time I was feeling much better. When I was first on it, I was also on Wellbutrin and Topamax. I went off the Topamax a couple of years ago and the Wellbutrin about a year ago. I am now on only the Lamictal (200mgs/daily), and I also take Protonix for acid reflux. Since July I have not been feeling well. I am pretty much exhausted all the time, my body hurts almost all of the time, I feel weak and feverish (although seem to have no significant temperature when I check). I can't seem to get through most days without taking a nap. When I wake up, I'm often more exhausted then I was when I went to sleep. I find myself feeling depressed, full of self-deprecating thoughts, and often I will get a word or phrase stuck in my head that keeps repeating to the point of making me crazy. Most days I just want to curl up and die lately. Having been severely depressed for 4 years prior to going in Lamictal, I find myself terrified by the thought of slipping back into those depths! My MD has done a bunch of blood work and finding nothing wrong suggested that I keep a food and symptom journal for a month and then go back to see her....YEAH RIGHT! I've been feeling like crap for the past 3 months and that's all she can offer me???? I see my med prescribe on Friday and plan to talk with her about this, and hopefully get some answers. So many of the symptoms I have could be attributed to depression and/or greif (I also lost my mother in February), but I just can't help but think that there is something terribly wrong with me, which, as you can imagine, doesn't help the feelings of depression any! I'd also like to add that the pharmacy I go to switched to a generic form of Lamictal around the same time all of this began happening, which may or may not be a part of it. I'm hoping that someone out there might have some insight into these issues, as I know that us "patients" often times have more of an idea what is happening to us than the medical professionals who prescribe the meds and diagnose the illnesses. Thanks for your time!