Lightnin' Hopkins has got a passel of troubles. They are worrying his mind. He's so messed up one minute he says it'll be all right because "the sun's gonna shine in my back door one day" and then a minute later he says he might lay his head on a railroad track. He doesn't say what's troubling him, but in today's context, he's probably out of work and maxed out on his credit cards. Or it could be a woman friend. Yeah, probably a woman. Only a woman could leave him so confused and conflicted about the future.
Old Sam Chatmon's got the blues too. His girl's left him but he says it don't matter. He's sittin' on top of the world. I believe the psych majors call that denial, but as a coping strategy, it's definitely better than the railroad track.