My dear sister had Parkinson's and several other serious conditions. She recently passed away but the doctor said the Parkinson's was not what killed her. I really miss her but I'm sure she's in a better place because she believed the following words from the Bible:
"For God so loved the world, that he gave his only Son, that whoever believes in him should not perish, but have everlasting life." (John 3:16)
"Believe in the Lord Jesus Christ, and you will be saved--you and your household." (Acts 16:31)
"Trust in the LORD with all your heart; and lean not unto your own understanding.  In all your ways acknowledge him, and he shall direct your paths." (Proverbs 3:5-6)