I'm a researcher and I've read everything on the subject of divorce statistics. I love numbers. Here are the stats on separations.
40-50% of all married couples will try again. Out of this group only 10% will make it. Reason being most people don't change so the problems that existed before will exist again. The average separation is 1 year. Men come back more than women do.
I don't have any real advice for you I just wanted to say the odds aren't as bleak as many would like you to believe. Work on fixing your side of the street. Difficult to do while she's there so my heart goes out to you. Good luck and hang in there.