Hi and welcome, @Benb , it's good you've joined.
I'm really sorry to hear you've hit rock bottom 😞
I really feel for you, being pretty much homeless 💔
As @Paperdaisy said, if you can go to your GP and ask for a Mental Health Care Plan, that will entitle you to 10 (20 during Covid) subsidised sessions with a psychologist per year.
We are also here to listen and support you the best we can (not being health professionals ourselves, apart from the moderators).
I know when I hit rock bottom, it caused me to make massive changes in my life. For instance, I was super-committed to religion, and now I'm secular. I also have a different group of friends. I managed to rebuild my life from a nervous breakdown where I spent 3 years in bed, suicidal. My life now is better and happier than before, but it took time to rebuild. I've had years of counselling with a psychologist as well. I'm only mentioning all this to try to give you some encouragement, that you can get through the "rock bottom" and rebuild your life and come out the other side.
A handy forum tip is if you type @ and then click on a name in the drop-down box, that person will get a notification and won't miss your reply.
Wishing you heaps of good wishes, @Benb ...