"Nobody Knows the Trouble I've Seen" is a spiritual. The song is well known and many cover versions of it have been produced.

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The Seekers
Nobody Knows The Trouble I've Seen lyrics

Nobody knows the trouble I've seen;
Nobody knows my sorrow.
Nobody knows the trouble I've seen;
Glory, Hallelujah!

(Repeat [bad word] 

Sometimes I'm up, sometimes I'm down;
Oh, yes, Lord.
Sometimes I'm almost to the groun',
Oh, yes, Lord.
 [bad word] 

I wish that I could find a way;
Oh, yes, Lord,
But life is just one long, rainy day;
Oh, yes, Lord.
 [bad word] 

Glory, Hallelujah!