My 78 year-old mother fell on her head violently in an accident. Since then she has has bouts of dizziness and stabbing posterior hedaches. It comes and goes. She recently consulted a neurologist. She already had a beneign MRI and CAtScan of the brain. I feel helpless. She is otherwise healthy and exercises. She is slender and eats well. the neuro. put her on Antivert and has tests of the brain planned for next week. Help.