Pretty much you have to take care of yourself if you have problems w/ Pancreatitis. It can kill you. But his behavior, his sulking, his bullshit is what landed him there.
Good for you for sticking up to him, but you really just stop associating with him outright. You don't need him, and he's just a dead albatross around your neck.
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."