Patti, Look up shy-drager syndrome or multiple system atrophy on your computer search engine and take what you find to your father's doctor if it seems to fit your father's symptoms. Ken has this and his blood pressure drops when he tries to stand from a prone position causing him to fall and possibly pass out. It is a fairly rare parkinson related syndrome so your doctor may never have seen a patient with it. Good luck in finding an answer. Barbara Smith,cg/Ken/70/17