I absolutely second treating it like a regular medical problem and helping him find professional help.* I'd suggest looking for a good psychologist before consi

I absolutely second treating it like a regular medical problem and helping him find professional help.* I'd suggest looking for a good psychologist before considering psychiatry, just because meds are a much bigger long term commitment. Another suggestion is exercise and meditation. Nothing strenous: if you can get him to even take a walk with you a couple times a week it'll make a difference. As for meditation, even a little bit can have a huge impact and I reccomend the excellent Headspace app. * Of course this stuff can be expensive and he might not have insurance to help, so here's where you can step up and search for local, free programmes.