This is the worst roller coaster ride ever. Sorry to see that you're on it. But what can we do? Try to make the ride as smooth as possible!
Have you found any of the self-help books helping you? Which ones?
Has your wife filed for a divorce? Or simply said she wants one? Is there a plan in place for what happens with the kids when she moves out?
You definitely need to stop focusing on her and focus on yourself. What are you doing for yourself (besides reading)? Are you involved with any activities?