Hi! My father-in-law was diagnosed about four years ago. He is 78. His tremor, stiffness, etc. seem to be relatively under control with his meds - his neuro thinks he's doing well - BUT - he is experiencing a great loss of energy i.e. quickly grows fatigued when walking, even short distances. This is of great concern to him. The neuro says his muscle tone is okay and does not satisfactorily explain this lack of stamina. Anyone else with this experience? Thanks, Sue