This project has so much potential to open viewers' eyes/minds to what the human spirit can not only cope with, but overcome. I would love to write the script with you! I'm a huge fan of people who have not allowed their disability or disease to prevent them from living their lives fully - Helen Keller,Nick Vujicic, and others have inspired millions and your video can, too. My younger brother was born with severe cerebral palsy, so this genre of subject matter is near and dear to my heart, even though it's about someone with a "particular disease" - whatever that may be - the indomitable quality of mind over matter is an excellent thematic scape.
I have been a freelance writer and editor for over 20 years, and screenwriting is one of my specialties. During this time, I've written a number of video scripts in various genres - I guarantee you'll be 100 percent pleased with the high quality script you get as a result. I'm very open to brainstorming and creating a cohesive interactive teamwork with you to ensure the result matches your vision. I typically write using Final Draft 9 for scripts, but can export as a PDF which maintains script structure exactly.
Thanks for doing this project - people who haven't personally experienced something along these lines or had a loved one who does/did need to understand more; this can help "normal"/healthy people be more grateful for what they have as well as being more willing to help such causes through volunteering and donation.