I am withdrawing slowly off lamictal. withdrew 12 mg from 300 mg a day. i now have insomnia. i started taking 3 mg melatonin plus vitamin b six 10 mg(in one bottle) before bed but it gives me headaches groggy next day. what else can i take for this?

Without a full history, including why you were taking the lamicatal and for how long, as well as other meds and medical conditions, there is not way to provide reasonable treatment suggestions. Talk to your Dr who is monitoring the slow withdrawal for Lamictal. Since they know your complete history, they can recommend appropriate treatment suggestions.