The origional song was written in 1913 by Harry Dent and Tom Goldburn

Though your heart may ache a while, never mind
Though your face may loose it's smile, never mind
For there's sunshine after rain,and then gladness follows pain
You'll be happy once again, never mind

It was published by the Daily Express in 1930 in the series "Songs that Won the War" and issued in its "Community Song Book No.3"
Bill^^