So sorry about Joe's friend and his family, and the effect it inevitably has on you too.
But Joe is the tortoise in the tortoise and the hare. He will get there, but it might take longer.
How lovely he was on a recliner, even if it took it out of him, and how nice for your DH.
He obviously has an amazing constitution that not all his hair has fallen out.
It's just going to be a slightly different path from some others, because he has a different make up. I'm going through something a little similar with my DM who is more than fragile and has a condition whose extent should have felled her several times. But something underlying means that she struggles on, perplexing the medics but enabling them to treat her. No wonder the neutrophils are not as high as they should be if not all the cancer has gone; I am sure the experts will say that there is no correlation let alone causality, but Joe is prob fighting on a number of fronts. He is a complete trooper, and tortoise...
Don't worry about the arguments, we had them too when Ds was so ill for years. The best you can do is try never to go to sleep on them.
We tried to say sorry we had shouted, even if we still held to our views, and blew kisses down the phone (sentimental I know, but it helped) and said love you when we rang off, even if we were still fundamentally convinced of the other's stupidity, selfishness or incompetence. Just those formulaic noises helped.
Take care of yourself. Can your DM help you to get that retina seen to? Eyes are important. And toothache is hell. Ditto.
Thinking of you lots,
Hugs