How do I get rid of a housemate who is lovely when sober but scary when drunk?

I interviewed my current housemate before he moved in and he seemed fine. He was easy going, fun, enjoyable and perfect. 3 weeks later I have noticed he’s drinking a lot and when he drinks he becomes nasty, scary and wordy. He is not violent but rambles and carries on, then lashes out at you with nastiness and makes you feel awful. I suffer from anxiety and depression and had it under control but now I’m feeling horrible. However, when he doesn’t drink he’s awesome. He’s a lovely guy. I just don’t know how to tell him to leave. I am afraid he might lose it with me and I can’t live that way. I hope someone can give me a suggestion. A sensible one.