I'm 82, in a wheelchair, & suffer from severe perpheral neuropathy. Why can't I get "Nuvigil or Provigil" vs. "Methylphenidate"? - as far as insurance is involved? I've insurance & Medicare, but neitther one will or authorize me to purchase Nu or Provigal. I can't afford the cost of Nu or Provigil. BUT-even my Dr. says Methyphenidate is dangerous & may cause a "heart-attack"; yet Nuvigil would work as well without the side effects! But I can't buy it!