A, The tone of the letter may be coming across that way because your h hasn't been completely honest w/his own lawyer. They don't feel the need to "enlighten" them on what they've been doing, but only what you can or cannot do, i.e., jump through hoops, walk on water, etc. They aren't rational, therefore, they aren't reasonable in their expectations of what we can or cannot do. They don't stop to think that there are steps that we must follow in order to get to the end result.
A, I don't think it was any one thing that has helped you since June. I think what has happened is that you've grown so much over the last six months and you have taken the "rose colored" glasses off and have been able to see the light of day in a more clearer way. I think you've finally come to realize that you've done all can to save your marriage and your family and yet, he's done absolutely nothing but tear it down.
A, definitely get something in place to protect you financially. It sounds to me like the bill collectors will be calling on your h very soon to pay up. You do not want to be involved in that mess and ruin your own credit/financial standing.
You've come a long way and have grown so much. Growing and spreading your wings will continue as you move along the path. We are always here for you, no matter what happens.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.