This whole song is very simple, as long as you have the voice for it.
The chords I saw in another tab weren't sufficient, and I figured it out for 
myself and love playing it...so here y'go.

Progression:

Am7 (x02010@1)  
Ooo lordy now, trouble so hard

F (133211@1)Ooo lordy now, trouble so hard

Dm (xx0231@1)
Don't nobody know my trouble but God,

G (320003@1)Don't nobody know my trouble but God.


These chords work for the whole song...I like giving it an almost reggae strum. Enjoy.