Michael J. Fox reveals Parkinson's struggle but remains determined to live with purpose

Michael J. Fox discusses long-term memory loss and intense pain from Parkinson's disease in upcoming documentary
He has lived with Parkinson's for over 30 years but aims to find joy despite losses
New documentary "Still" releasing on Apple TV+ follows Fox's private journey with the disease
Fox encourages others to learn from his experience staying optimistic in face of health struggles
Though Parkinson's is degenerative, Fox says "I'm not going anywhere"