for over 2 years my 44 year old daughter is getting all of a sudden it will happen, she will feel it coming on but no way to stop it,wobbly legs that start jerking at the knees then she blacks out must of the time , also along with it she will have headaches, numbness in her arms and now starting to get it in her hand where she can not hold on to anything for a while,, no Dr. has been able to detect what the causes are for this