My son's hair is falling out

I used to make posts about my son a few years back because i was wondering if he was gay because him and his best friend Ethan were close to a level that's seemed like it was more than a friendship. They would even shower together. My son is actually pansexual and him and Ethan were dating and got married. My son got married pretty young. I was happy for him. I support him and was happy to share their story. Unfortunately he moved in with me back in with me in August because him and his husband separated. My son confessed that Ethan has been struggling with addiction and he's tried to be there for Ethan but it's to the point a separation needed to happen because he refuses to get help. He told me he tried to stick it out. Ethan has no family because they disowned him because they're all homophobic. He tried so hard to stick it out but the addiction got so bad that Ethan has become a person none of us recognize. My son left because Ethan put hands on him for the first time. He found pills in the house and threw them out and Ethan kicked the door down and kicked him into a dresser. So he knew it was time to leave. He's trying to decide if he's going to divorce. I think he's still giving Ethan time to get help but at the moment they're separated. He has a break down this morning because he started experiencing hair loss and he didn't realize how bad it was until he put his hair in a man bun and saw his scalp. I don't know how to help. He just started crying saying he doesn't want to be here anymore because he's not just losing his husband. He's losing his best friend of almost 2 decades. He's losing his hair. I'm lost guys. I don't know how to help. The hair loss seems to be pushing him over. I wish I had a happier update but I'm scared his depression is really taking a toll and hair loss is making it worse.