+1! "Get you a good layer, a very good one. And be prepared for the fight of your life"
I would add start making financial preps-discuss with lawyer.

She's abusive and you want to get away from her and be fair right? Soon she'll get abusive to the kid too, then you'll have to do something. She doesn't sound like a good person, you better start making preps yesterday or bad momma gonna get long term alimony, assets and the kid w/15 yrs. + leave you with nuttin. You got a lot of money to fight? Settle fast if no or you gonna have financial ruin long after expensive fight, maybe run out of $ near the end and fold. Prepare to be "softened up" with all sorts of actics making you think "it's best for the kid".
Forget about proving mamma abusive, judge doesn't care. You need to prove your own worth, the best you can hope for is 50% and that is unlikely. Don't mix money in with the kids in any way, not in the same thought or paragraph. She can do that but you can't! Be very careful, have a witness around. Good luck, first line has best advice. Ask him his plan to win in an interview and interview several. martindale.com