@starlightgazers
I'm sorry you've had to cope with so much, that sounds so painful. 
I want to echo your post, asking those PPs who are bleating about MH issues on here whether they would be prepared to do anything to help. Because this is definitely a really hard time for those with MH problems, especially those who are living alone.
My DB is very much in that position. He has serious MH issues. (So do my DSis and I, PTSD due to childhood SA), but we've managed to get our shit together and we have happy family lives. (Our DDs of 11 and 8 are adopted, so it's not without challenges but that's for another thread.)
My DB can't cope with life at all and is very lonely and has always struggled socially. He's for that reason always been very dependent emotionally on my DM (he can be abusive to her too, so it's not particularly healthy), but now she has to self-isolate, aa she's 80 years old now. He has no friends so is alone all day and my DM has told me that he isn't coping well.
But it's right that she should isolate from him. She catches every infection going round and my DB's hygiene isn't good. This is a time when a strategy needs to be found to help people in his position; he has a social worker now, so hopefully they will assist in some way.