There's nothing like a good bypass surgery to make a person feel like new again--seriously. When things are working more like they should, William will feel better than he has in years and you'll have to run to keep up with him on your next trip to WDW. I know this from personal experience. Also know that there are decent, compassionate people who will help you rearrange your travel plans. If you're dealing with Disney Travel or any department at Disney directly, you'll find people who know how to take care of things and they'll likely send William a get well greeting personally signed by those who helped you. I know this all is a shock and seems so scary. Believe me, I do know. But trust that this surgery will make things better. Best luck.