You really need to stop enabling him, you need to look after you or you will become like him, helpless. He needs to find help outside of you, you have done all you can.
He really has no incentive to find help for himself because he has a nice comfy home and someone who will ‘find’ him money from wherever, whenever he wants. He’s not a child so make him fend for himself.
You really are going to have to be cruel to be kind or nothing is going to change.
I hope you find some peace soon.