I understand what you are going through. It is very hard to deal with separation and divorce, especially with children. I am a single divorced mom of a 13 and 14 year old boys. Do not be dismayed my friend. God is your rock and your fortress. Although it doesn't feel as though He is in control right now, He really is.
Take time and pray. I assume your children are grown and can care for themselves? If so, take time for yourself right now. Let God work to heal your heart. Whatever caused this separation/divorce, you will have to allow time for God to mend the brokenness you feel right now.
Spend time with your good friends. If they are few, then there are many good people here who you can come and fellowship with. There are chat rooms open 24/7. My inbox is open always, so please feel free.
One again, don't forget to pray and don't harbor anger. I'm sure there is some there and there will be for a while. Just don't harbor it. Talk it out, and pray it through.
Many hugs and many blessings to you.
*Sunny*