If there were a blues song about living with chronic bad health, I bet most people wouldn't sing about 'love gone bad'. No doubt, holding onto relationships is hard with chronically bad health. I've worked with people who blame illness for failed relationships and there's much to be said about that.
But from what I've seen, we cry most frequently about whether to participate or not. "To be or not to be?" wondered Hamlet. He knew that choosing between two bad choices wears a person down.