Lamictal and leg pains

I have been taking Lamictal for a few months now. I have horrible pains, tingles in my feet and legs. At times I feel like I am getting electric shocks in my feet. I started at low dosage of 25mg and now up to 175mg. I am taking this medication with Lexapro 10mg for depression and bipolar. I am also diabetic and thought maybe these pains are from neuropathy. I got tested for neuropathy and it was negative. I am not weening myself off of Lamictal and my leg pains are subsiding a bit. I now have a bad headache. My nose has been running to and I have bad waives of nausea throughout the whole time I am on this medication. I hope when I am fully weened off that this side effects will go away.