Welcome mbca14, we see you
You sound exhausted. What a roller coaster to be on -- the downs are horrific, but the ups have you questioning your decision to get off the ride.
You're in the right place. We get it -- maybe some people would say "it's so easy, just dump her and leave" or other people would say "it's so easy, you committed to her, no matter what, so stay". But these are the HARDEST situations, and when you're "on the roller coaster" so much, it can be hard to get time to yourself to think through the nuances.
That being said, you say you are done with the abuse. It sounds like you've had a realization? Or a line was crossed? Or maybe something more gradual has unfolded?
When you feel ready, please share some more with us -- how many kids are in the home, and what are their ages? How do they seem to be doing with your wife's volatility?
In the past, did things seem "good" or "better"? Did something change suddenly? gradually? Or, looking back, was she always kind of like this?
Do you have a way to be safe from the abuse? Do the kids?
Hope these questions aren't overwhelming... we're here for you.
-kells76