Q. My wife is suffering from a headache that has lasted for four years. She's tried dozens of different medications, none of which give her any relief. At first, her doctors suspected she had migraine, but they eventually determined that wasn't the case. Then they said it was a "dead nerve" and gave her an injection, which did not change anything. If medical practitioners suspect a nerve issue is involved, could they do a nerve block to see if they are correct?