I'm so sorry you have been going through such a difficult time. It must be even more frustrating to remember how you used to be and not be able to get back to that person. From what I understand therapy takes some time to be effective so keep going even if you don't feel like it. Are you getting any kind of medication? It helped me so much. I would never have made it through without it.
Try to be patient with yourself. You are trying hard to get better. You are concerned for your children.
Maybe try to do one thing in a day that you want to do. And one thing that you need to do. It will help you feel better about yourself.
The old you is still there. You can reach her again. You may just need a little help to get there.
Good luck