Have Hope
I understand how scary this must be... In order to successfully do this, you first must get yourself in a place both physically and mentally where you feel safe. Some people use scare tactics as a strategic weapon. There are other weapons too (and they might not be evil, just desparate to keep you) like getting us to drink, use pot, etc in order to delay the separation. In my case, while I began pursuing a divorce a few years ago, my MI was so bad that I was imagining my husband as a person who was more terrible than he really is. My anxiety had sent me over the edge. I am not saying this is you but felt the need to present all sides of the situation. Create distance from him while keeping the lines of communication open (through a mediator?) so you can think clearly.