Need some advice brother is going down hill since his divorce....?

My little brother and his wife divorced because he walked in on her and his best friend well he has a two year old son with this lady and they have a visitation schedule if you would call it that and he pays child support and loves his son so much. But he is struggling and he is depressed and when he isn't working or with his son he just crashes and isolates himself away and drinks to the point that he has ended up in the hospital. I am so worried about him he is only 24 and i don't want to have to bury my little brother! And on top of it all his ex has started giving him chit when he goes to pick his son up and has recently started trying to deny him visitation just to be spiteful and its just sending my brother on a downward spiral. Advice?