I think it's about a man who sacrifice a lot to become rich:
"and he worked like the devil to be more."
He makes it:
"A different kind of poverty now upsets me so. "
but loses his woman on the way and realises that money doesn't make you happy:
"I see that it is empty and there's devils in my head"
When he see that he has devils in his head it could be a metaphore for him realising that he has done some wrong things on his way to the top.
I think it's about a man who sacrifice a lot to become rich: "and he worked like the devil to be more." He makes it: "A different kind of poverty now upsets me so. " but loses his woman on the way and realises that money doesn't make you happy: "I see that it is empty and there's devils in my head"
When he see that he has devils in his head it could be a metaphore for him realising that he has done some wrong things on his way to the top.