My father is a 76 year old who was dx with PD. He does not have any tremors, just really bad stiffness & his joints crack all the time. He loses balance & has fallen a couple of times. My question is, can it be possible that he was wrongly dx? He's taking sinemet 25/100 3 times daily. It has helped his energy levels. I think. I see him more alert during the day. Before he would just fall asleep anywhere & wouldn't have any energy for life. I don't let him drive anymore & requires assistance getting dressed , bathed etc. Its been a struggle but he's my father... I won't give up on him.