dw,
I am really so sorry that you are going through this; I went through similar things with my ex, although not to this extent. Yours being a lawyer makes him much bolder, I think.
Mine told friends, family, and people at church (including the pastor) that I was 'on something' or I wouldn't 'be acting this way' (referring to divorcing him). He told people all manner of hurtful things that happened to me and that I had shared with him in an effort to show them that I was off balance mentally. He used things that happened to me as a child, a sexual assault in my teens, a much-regretted (for me) abortion, and other things to demean me to everyone.
Don't let your guard down for even a moment and don't be surprised at ANYTHING he says or does. DO NOT REACT, just document it all and give it to your attorney.
Hang in there, you will be fine!