I'm in the US and in a no fault, community property, bifurcating state. One thing to remember if you are in a NF state is that he cannot stop you from terminating the marriage. Another thing to remember is that in some states you can 'bifurcate' a divorce. This means that the marriage can be terminated and that the finances and child arrangements continue to be negotiated. If you haven't, ask your lawyer if either of these apply to you. If he's going to be an ass (and he is) it may be to your advantage to bifurcate. Community property is pretty simple, everything acquired during the marriage belongs to both of you, regardless of who earned what, who paid for what, and whose name it is in.
As far as finances, please don't write off your share of the marital assets, especially if you are in a community property state. Maybe you feel you don't 'need' them, but DD is entitled to them and they will make her life more comfortable. By that I mean that making yourself more financially secure can only mean a better quality of life for her.
Your MH is not truly going to affect child custody, as others have said. You had PND and you had a period where you drank a bit more than you should. The bottom line is that you sought help, you listened to your 'team', you followed their instructions, and you no longer have a problem. In the end this is what a judge will be looking for.
This probably will not stop STBX from dragging up things you'd rather forget. His point is to make you as unhappy as he possibly can. I'm sure his lawyer has advised him against this as it's a real double edged sword and can make him look really vindictive and nasty, especially since you got the help you needed. So you're going to have to steel yourself for that and for most likely having to respond to it. As far as what is 'normal' custody, that varies widely from state to state, county to county, and, frankly, judge to judge. Your lawyer can tell you how things usually 'work' in your area.
Listen, he doesn't really want 50/50. He wants to make you look and feel horrible. He wants to cause you pain because you dare to see him for what he really is and say it out loud. You refuse to stay in your little box as part of his 'brand'. And so you must be punished. That's what this is all about. So you stand tall, see him clearly, listen to your lawyer, gather RL support around you, and you persist. Because that is what we do. We persist and in the end we get, if not everything we want, we get what we need.
You can do this.