OP, here's a word of advice that helped me when I felt frozen
All these thoughts you're having? they aren't actually what is making you feel frozen.
what's happening is that your brain (like almost all human brains) is hard wired to hate change. This was useful back in the mists of time, where if you changed camps, or took a different route through a forest, or left the protective boundaries of the village, etc., you could end up killed quite easily.
But we don't live in those times anymore, it is safe for you to change now. Unfortunately, your brain doesn't realize it's 2017 though. SO you have to contend with all these terrible thoughts and anxieties as your stone-age brain desperately tries to make you "see sense" to prevent you from being eaten by a panther or some such.
The thoughts you're having are red herrings, they're created by chemicals in your brain that are anticipating a disaster that won't actually happen. Your brain is trying to keep you safe from something that isn't there. The thoughts and anxieties are not the real problem... they are a symptom of a panicking nervous system that is afraid of change. That was, in a sense, actually designed to prevent you from making changes to your life or routine!
You can allow all these thoughts and anxieties to happen, they don't mean anything, they aren't real, you don't need to stop them or make them go away. You can move forward and make changes despite all these feelings. The trick is to start seeing the thoughts for what they are -- they're phantoms, they aren't based in fact. You CAN make progress to leave this person even though you're having anxious feelings and thoughts.
I send you my very best wishes and love. You can leave him, and you should. You deserve to feel peace and contentment. x