Thanks everyone. He did mention that coloring w/ crayons helps tone them down. He does talk to them so I told him to tell them to shut the hell up. (Don't know if that's good advice or bad?)

He's starting to think the voices are aliens trying to communicate with him. I've heard people on here say similar things. I guess if one is constantly hearing them, it's easier to believe they're coming from an outside source than one's brain.

I've been reading about foods and supplements that can help. He won't take vitamins or anything else so that will be challenging. Although he could eat the foods high in the stuff he would need. I'm still researching the food connection.