Stephanie, it just breaks my heart to see John and you going through this. As the others have said, Wegs does not shorten the lifespan when it's treated properly and you can stay ahead of complications. People might hear it's incurable and automatically assume it's terminal. Not true! Please do not think this is the best John will be. I believe his docs will help him over these hurdles and he'll begin to turn around.
Looking at your posts, here are the things that leap out at me that I would bring to the doctors' attention:
1) Severe depression
2) Stomach issue
Ctx can cause
gastroparesis, which means the stomach is not as active as it should be and the contents sit there too long before emptying. Some of the symptoms are nausea, heartburn, stomach pain and weight loss. If acid is refluxing into the throat it can cause symptoms like easy gagging and difficulty swallowing. Many doctors miss this diagnosis. I know of at least one Weggie who had this for quite awhile but her doctors ignored it. I would really lean on them to explore the reason for his throat and stomach problems. Some tests that would be indicated: gastric motility test, x-ray and/ or CT of head, neck and abdomen. In the meantime, I think he may have to accept a feeding tube. Malnutrition causes depression, so he's locked in a vicious cycle.
3) General, severe decline
It could be caused by the 2 issues above but they need to take you seriously and rule everything out.