It is a devastating and sad disease. I hope you can get to Alanon and get a group of supportive friends around you. This is the best decision for all three of you now. Stay in the moment. If we are in the past we are depressed , if we are in the future we are anxious so try to be in the now. I am post divorce three years. It gets better. To yourself be true. Your daughter will still see her Dad. I am glad you are here.