You are right to feel angry and sad. But most of all you are right to know who is most important in this situation, your girls. So be strong and find your answer for a better life. Decide to fight for what is rightfully yours in the divorce but also don't rely on it. You can make a wonderful, positive life for your daughters on your onw. That is what will make you and your daughters stronger later. It will be hard and slow in the beginning but remember that they are watching you and learning from how you handle the rough spots. From you they will learn to be strong women and mothers.
My mother-in-law got divorced when my husband was 17. She went back to school at the same time my husband started college. Student loans abound in that house. But now she is strong, has been working for 20 years, remarried, greatly happy. It was hard. They lived on very little money those first few years. So little that they could have gone on welfare but she never let that on to her sons. They struggled and yet she stayed so positive. Now, she has a very friendly relationship with her ex and she is 10 times better off then she was then. In all of it she never turned a bad word on her ex in front of her kids. And thus they never resented her for the hard times they were in. Both her sons adore her now for being strong, supportive and a mentor to them. You are 40 and that means you have a whole life to create ahead of you! The best revenge is your own happiness and success! My father took everything when he left my mom too. But she had us! Worth more then money! There is one thing your girls deserve and it is your love. Again worth more then money! Stay strong and find 3 things every day to happy for. God puts them there. It is our job to find them.