Surely this is one of those floating verses that turns up numerous times in various songs and by various artisits.Like all folk song it isn't possible to say which is the correct or incorrect wording as there is no correct wording.The first one that comes to my mind is:

Some folks say that the worried blues ain't
Well it must not have been them old worried blues they had

Again only a slight variation, there are dozens or more.

A blues line that I am particularly fond of is:


If it wasn't for bad luck I wouldn't have no luck at all


Just about sums things up in one line.