I think I understand better what you mean now.
For me, my daughter helped me see as far forward as possible. What abuse I was somehow able to tolerate when it was only toward me was unacceptable when I saw it directed toward my daughter. I could look down the road and imagine her being abused by him, and her ending up with an abusive partner, or her being abusive. My H's whole family is abusive - the men and women both. It was so easy for me to imagine daughter following that same path. My daughter is just a little younger than yours, btw.
What also helped me, tangibly, was to write up a list of abusive incidents. I got a calendar and carried it everywhere with me for a month or two. I wrote brief notes down when I was alone. This was to prove to myself that I wasn't over-reacting. I often would forget what the argument was "about" and blanked it out. Or I would see bad events as single, instead as part of a pattern or overall problem. In addition to the dailly incidents, I wrote a composite list of the biggest offenses I could remember over the years.
Right after I left and sat in the dark with my daughter in the shelter I wondered whether I was over-reacting. My family was shocked. Everyone was shocked - maybe it was all a misunderstanding, people suggested, helpfullly (ha!). I got that handwritten list out and read it by what little light there was and it helped me stay focused and calm. No, I wasn't over-reacting. I was finally "seeing the light".
There is a lot of resistance in society to fighting verbal/emotional abuse. Others may not be very supportive of you. Marriage counseling will not help abuse - in fact, it usually makes things worse, studies show. It's so important to have the support of others. A shelter might help you. A one-hour talk on the phone with someone at the Shelter one day did wonders for my plan of action and overall direction. They were so nice and non-threatening and not pushy, but validated my fears right away.
Also, while you're quietly planning this divorce, try to get a recommendation for a lawyer from a women's shelter, or women's advocacy group in your town. Again - this cannot be stressed enough. The avg person (and this includes lawyers) does not understand abuse very well, and the wrong lawyer can make things worse for you. Better to have one who understands the patterns of individual judges w/rt domestic violence issues.
You will need that list of his abusive incidents if you want to maximize your chances for keeping the house and more importantly, for keeping your child (children). Do not assume that just because you have been emotionally abused that the legal system cares about it. They will assume that you are exaggerating and that it isn't really "that bad". It is so hard to document emotional abuse, other than you making up a list with dates whenever possible. If you have been physically abused, then that will carry some weight, possibly a lot.
Document every case of physical abuse you can remember. PA is not just one person hitting another. It also includes threats to hurt another person, whether with words, or with a fist held in the air. It includes, destroying your property. Find out what constitutes PA in your state and document whatever happened to you that is in that category. You may need it. And if you do need it, you'll need that list right away, and not in a week or two while you put it together, kwim.
Hang in there! Pm me if you want. I'm in the thick of things now, so it's all fresh on my mind.