I have Neurapathy and am taking Divalproex,500 , one a day. I feel fine during the day, but at night, I wake several times a night with my legs from the knees down, feeling like they are bursting with hot needles. The only relief I get is from getting up and walking for 30-40 minutes. This happens very hour or two. I am very wobbly and must use a cane or walker in the day. Is this the right medicine ? I am 92 years old.