Ask HN: How to get past your wife's past?

I recently got married and found a few things about my wife's past that has wrecked havoc in my mind. I'm not able to focus on work, and feeling low self esteem and depression. Logically, I understand that past is past, and it's gone but when I try getting back to work, my mind goes lost and I feel like crying. Have you ever been in this situation? How do you force your attention to your work?