Hey soul sister, I'm right there with you.
According to my AH, I too am having a mid-life crisis, which started when I left him in November. Somehow all of the many, many, many times I told him I was going to leave if he continued on the same path have nothing to do with it.
Whatever he wants to call it, I call it a mid-life revival. I agree that it's tough, and that one finds out who one's true friends are, but all I have to do is review my journals of the last 7 years to realize how very very glad I am to be out and putting my toes into a new life.
Are you a reader? There are some helpful books on what we're going through, including "Warrior Goddess Training" (the title makes me cringe but the book is good) and "Life After Divorce: Create a New Beginning."