my mother is 82, she keeps having spells where her leg in the hip area makes a quick jerk and she almost falls, if she did not have hold of he walker she would go down. She says that there is no pain, She has seen her family doctor and a Neurologist because she said it was like a lightning bolt when it happens I assumed it might have some thing to do with nerves not muscle weakness. Neither doctor can figure out what the issue is. I need to know what type of Dr. to take her too, this has been going on for over a year?