Partner with mental illiness

Hi
I really don’t know where to start. I have been with my partner for 26 years. When I met him he told me he had depression due to his father’s death , his dad was a quadriplegic he got hurt in an accident when my partner was 18 months old . He told me he was on Paxel and Xanax and has been as of now for about 40 years. His depression didn’t seem to be too big of a problem until the last year or so . I mean he had anger episodes for years but they have gotten worst since his family no longer speaks to him or him speaking to them for a number of reasons. Well the last few months have gotten much worse. He lashes out at me and always seems to blame me . I am not perfect and yes at times may be at fault for these arguments . These arguments are not big that there should be a big blowout to the point of him calling me terrible names and calling my family names . He talks about his past and his family on a daily basis stating they have ostracized him for no reason. The last few weeks he has attacked me with words and has told me I need to leave his house, which is in both our names but he owns 80% of the home. Last night was the worse . We were laughing about how he was stoned smoking weed ,( I do not smoke weed he has since a young man. )He and was wobbling back and forth that’s where the laughter came from . I went into the bedroom and he came in and started to tell me I was playing with him spiritually and and mentally and told me I had to leave. I said to him what are you talking about we were both laughing. Long story short I saw what I believed was a meltdown , I had never seen him like this since I met him . This was about 10 mins . after he smoked weed from a cannabis store, it seem to me he had been smoking more and more of this daily 20% THC . He screamed at me called me awful names then he got up from bed and got him switchblade knife and was not talking rationally. He told me that he could pull me by the hair and throw me down the stairs , he also said he could kill me but he won’t . He told me I was evil , a narcissist and I was the devil. Then he called his ex- wife got her VM and said this is your ex- husband call me asap this is a emergency please call me right away . She is evil ( meaning me) and I don’t want to hurt her. Then he told me he could stab me if he wanted to . He called the police told them to come to our address that he had a switchblade and didn’t want to hurt me . He then told me to not move off the bed tore all the covers off . He kept saying I’m watching you (while trying to find local police number ) don’t more or I’ll stab you . Now I was really getting nervous since he was blocking the doorway . I told him I had to go to the bathroom , so I could get away and said I can go to a hotel if you want me to . He kept telling me to shut up or he would stab me . When he started talking to the police I then decided to get up and leave the room . I ran down the stairs got my car keys and ran out the door to my car and locked it. I myself then called the police and told them he was not rational. Police came they asked him what was going on and he told them he was nervous and scared I was going to hurt him . After they talked to him for 5 mins or so they took him to local hospital and sectioned him . Asked me if I wanted to get a restraining order that it was 100% justified. I reclined . He called me this morning from hospital asking me to pick he up and he wasn’t mad and we would talk a bit then part ways . He is now at a psych hospital now . I want to give him support but I am really scared especially thinking about when he comes home . Local hospital stated psych hospital would not send him home unless he is ok . I don’t know what to do when he comes home . I have nowhere to go and stay . I did pack a bag in case I need to leave asap . Please any feed back would be great . I’m sorry for the lengthy post but felt I had to give some past history on him.