Alan, My husband has shy drager syndrome as well as Pd, and his blood pressure can vary from 210/120 to 60/30. I have noticed that his speech and other cognitive functions are better when his BP is higher. I think it is related to the amount of blood or at least oxygen getting to the brain at any one time. Of course, sometimes, when he stands up too fast, he passes out altogether, but if he stays conscious, he seems very confused. He takes salt tablets and several medications to help with this. Perhaps your neurologist can help. Good luck. Barbara Smith, cg/ken/69/16yrs