I am so sorry. Please, please continue to post so that we can be here for you. Let's try to work through everything that has happened and see where you can go from there. The first person that we need to help is you. You need to focus on you and what you can do to be the best mom possible for the children. It is going to be one step at a time.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.