Thanks, everybody, for those ideas.

It is tough to invest almost all my time and worries and thoughts into a business that I never wanted. I'm just doing this for my brother and my mother. It leaves me no time to even think about what I want for myself. I just keep on grinding at the grindstone for the past 15 years with nothing to show for anything. Now I'm 50, and I don't have the opportunities I had at 35 - even if I could escape this trap. I actually became psychotic in 2009, and I suspect it was partially due to my unhappiness over these circumstances. Now there is less anger and just a feeling of defeat.
But I agree that burnout will eventually force a person to recuperate if they don't do it before then. So hopefully I can do that