I get you, Ron, I really do.
I've been like that my whole life - the longest I've ever been without a job since I was 16 is the 5 months I took off when I first retired 5 years ago. It's an attitude of mind; a sense of duty we were either born with or which was instilled into us from the time we were children, and it's not something we do to be martyrs or cause pain and worry to those we love. It doesn't even feel as if it's a matter of choice.
But I've come to realise that causing pain and worry IS what we do, along with making ourselves worse and risking our long-term health, which in turn puts more pressure and stress on the people closest to us. I have turned my husband into something of a basket case - nowadays he's a nervous wreck if I stumble or trip, because he's had to nurse me through the long and painful aftermath of a couple of serious falls (one of which left me in a wheelchair for a year and now permanently disabled).
So I think it might be time to take that strong sense of duty and responsibility and turn it towards finding a way of arranging life for you and Tina so that you can continue to be together, enjoy each other's company, and safeguard your health for the future - while you still can...
Big hugs, Ron - I know this isn't easy for you. xxx