I don't read many OT threads anymore but read this one.
I feel for you fella.
Middle aged myself and have never married and no kids. Sometimes I want to or would like to leave a little gonzo behind but I just can't do it.
I witness couples that I thought were the happiest people on earth getting divorced way too often. It's no picnic and takes tooooooooooooo much work for myself.
IMO they all turn FREAKING CRAZY eventually.
Good luck and as said, get the nastiests/results lawyer you can afford.
Hang in there!