lex-drinking, marriage falling apart-Hers

New here tonight. Can’t sleep my life and marriage falling apart. My wife got on lexapro 5 weeks ago. She’s been steadily drinking while on it. Like a light switch she changed and wants a divorce. She was struggling with unexplained anxiety which is why she got on ssris. Now our wonderful home, family and marriage is falling apart. She won’t speak to a counselor or any of her family members or any medical doctors. She got the meds from “hers” online. What can I do? I’m so afraid as I watch her slip away