Please forgive me if I'm a) completely wrong with my assumptions or b) missing something that's been suggested already. Also I'm no expert at all in property ownership, but here goes with my question...
I read in your post that you have another house in your name. You said it's rented - does this mean you own it and are renting it out? And the lease for the tenants ends in January?
If that is the case, are you able to sell that house in order to facilitate you buying out your partner? I know it's not an immediate fix but is it a longer term solution?
I could be completely wrong there so apologies. Regardless though, you have absolutely no reason to be ashamed. You haven't done anything wrong. Your brain is working overtime. You're focusing on the worst that could happen, because normally that's the best way to prepare. But when you're clouded by anxiety, preparation doesn't happen, it just snowballs into thinking about every minute detail of what could go wrong.
If you don't mind entertaining this suggestion, are you able to try actively thinking about what's the worst that can happen? As in, give in to your worst fears and let your brain run wild. What would happen if your friends or family were angry. What would happen if he attempted to take his own life.
I appreciate it seems grim when put like that but surprisingly, when I'm at my most anxious, this helps me. You're able to plan for the worst eventuality and make peace with it. You're able to say 'okay, he might threaten suicide', but then you'll quickly be able to decide that you're 'okay with that'. You're currently trapped in a cycle of thinking briefly about the worst, then kicking yourself for caring about it, then accepting that you're holding yourself back, then staying put, rinse and repeat.
Chances are, the worst that could happen won't affect your life or the life of your daughter any more detrimentally than staying put would do. Once you're able to understand that, by giving yourself a break, you can compose yourself and your thoughts.
As I said, I know this seems counterproductive on paper. But at the worst moments of my life, this has helped me. Not being hard on yourself doesn't always mean not thinking negatively. It sometimes means allowing yourself to think negatively, so you can move on.
I sincerely hope that helps in some way and I hope even more that whatever coping method you choose, you can move forward to your better forever 