Wow, this was me a year ago.
What kept me from leaving my abuser for so long, in large part, was the fear of living alone. I had constant anxiety the house would be broken into and this that and the other would happen.
Your brain is in survival mode right now. It is in survival mode because of the abuse. You have made the entirely correct decision to leave this vile piece of shit. Do not go back on that. Because your brain is in survival mode, it is perhaps working on overdrive and thinking shit, but how am I going to survive if xyz happens?
Anxiety can be helpful up until a certain point. This is that point and you need to recognise that. It is useful to remember that you are in more imminent danger staying with this man, than you would be if you were to leave.
Tips for home safety:
Get cameras, where potential offenders can see them but not reach them.
Keep a weapon of some sort close to you or In every room, in a concealed place unreachable by your children.
Get extra locks for you doors.
Get alarms.
Google every possible deterrent for criminals breaking in. Implement them. This helped me a lot to feel safe.
It is highly unlikely you are just going to drop dead at any minute. Thats the abuse and the anxiety speaking. Thats the dysfunctional survival mode trying to come full circle and keep you where you are 'safe', in your comfort zone (which it really isn't, as you have realised).
So many women live alone, and with their kids, too. You can do this. You will be fine. All you can do is your best to prevent these worries you have, by keeping your house secure and keeping yourself healthy. Have faith in yourself. You and your kids are on the cusp of freedom, ready to live a life free from abuse. Dont throw it all away out of fear.
Sending hugs 🫂 cos I know you need them. I've been there. You can do it. Good luck.