I'm sure your family are only trying to help you but they don't really know how.
I can only tell you about someone I knew who was acting just like your husband. He said that what he did was because he loved his family so much he didn't want to leave his family in financial problems and we told him it wasn't the most important thing at that time for his family, but he said that in case he wouldn't be there for them one day, at least it would be one less thing to worry about.
He also said that work was one of the thing he did best in his life.
This guy worked for his living but he also worked for a past-time, that's what he loved to do.
So, in the end he said that what he did, he did for the love of his family and also for himself. He said he had only one life to live and he lived it the way he thought best.
Also, my dad has had a heart condition since he was 42, and now he's 62 and he always pushed himself like that and we continuously tell him to relax , that it's not good for him, because of course we're afraid of losing him, but he also said he has one life to live and he'll live it the way he wants to, that he's not going to wait around to die.
At some point I was really worried and I talked to a health professional and he told me that if that's what my dad wants, and that's the choice he made that we have to respect him, respect his choice for his life and learn to live with it, that we can't decide what others will do with their life, we just have to accept it. It's a real hard thing to do. At the beginning I hated that doctor for saying that to me but now, after a while I know why he did.
I look at my dad and he doesn't stop one minute, but he's happy and that's what HE wants to do with his life, he pushes himself all the time, it's never enough but my mom said he's been like that all his life. She knows him best and she knows he'll never stop because he's afraid that if he does stop pushing himself that's when he'll die. And she says he's probably right, he needs the action and the exercise.
So, I realize that I was selfish because I want my dad to be around longer because I love him, but I want him to be happy and proud of himself so learned to accept his choice and and instead of worrying, just enjoy the time we have with him. We don't know when he'll die but when he does, it's going to hurt a lot, I don't know how I'm going to deal with it but that it'll be my problem. He's always there for us so now it's up to us to support him in his decision and be there for him.
And one day when he won't be there anymore, it's going to be hard to live without him in our lives but I'll remember all the good things we did as a family and I'll have good memories of him for the rest of my life and hopefully it's going to help me to get on with my life.