Hi mumto2,
I am so sorry that you are feeling so down at the moment.
i can empathise with everything you say. I have suffered from depression on and off since I was 19 (am now 51), and have had cbt, counselling and am at the moment seeing a psychiatrist. Everyone I have seen has picked up the same thing, that my expectations of myself are too high, and that I am trying to be a perfectionist, and when I cant achieve that i beat myself up. in your post you said that you wanted to be the best mother and wife you can be, but are you expecting too much of yourself?
I hope that you begin to recover soon. perhaps you should ask your GP for some talking therapy, Anti d's take the edge off depression but it isnt addressing the real problem.
TC