the best advice I could give you is do what you don't want to do...
if you dont feel like being with friends then aim for at least one time a week, where you "make" yourself have fun, maybe you will begin to enjoy it again, try to write down what you don't like in your life, but also write down what you do like, look at what you can change, and do it gradually, and the things you can't change accept that, and try to see tham in a new positivve way, try buying a book about cognative therapy(changing the way you think)
tell your family how you are doing, take time to talk about it, but...
remember it ok to have FUN!
try set yourself small things that you should do every day to makee YOU happy, may paint your nails, but your favourite food, whatever, but think of you in a positive way.
you know, you are a good mum, you are not a failure, and people genuinaly love you for who you are, belive in yourself. you are beautiful funny and smart, life will look better for you soon. don't give up, enjoy life, life is what you make it.
maybe try taking vitamins, if your diet is not that healthy, that can sometimes give you and extra burst of energy.
lets us know how you are doing
remembee love you and look after you, God bless