My husband is suicidal and refuses treatment

Hello, this is my first post. Lately my husband has been suicidal, he can be very aggressive and has even started self harming with anything he finds around him. We’ve been married just over a year and he is going to uni and working full time so he’s under a lot of stress. I’ve tried to convince him to see a doctor, or psychologist but he refuses. I even suggested he take a break from uni and have been helping him put out resumes but it really doesn’t help. After he started self harming at night, I told one of our close friends and it helps to go out with them, but only for a little while. Living with him can be like walking on eggshells because I have no idea what is going to set him off. He gets really aggressive to the point where he’s punching things and yelling at me. It’s been a few months of ups and downs and I’m not sure what to do.