I to, am sorry to read of your despair and troubles...I would firmly suggest, like the others have, , you get yourself into counseling...right now, your mental outlook is so important!
You cannot control your children, however, you CAN control how you think and feel.
No one can know the pain your going thru, however, we do know, that right now your first and formost.
I'm wondering if you work? If you don't, I would try and pick up something to keep your mind occupied. Or get going on joining a group of which you could explore a hobby you might enjoy learning about....some kind of classes, such as gardening, knitting, sewing, swimming lessons, the gym, but do something for you....
I'd really like to hear more about you, what you enjoy doing...who you are, and what you do for stress relief....you cannot change the past, but you can change the now, today in how you feel about yourself....you are a very significant person and have a journey to complete in this world...don't allow anyone to interfer with your happiness...life is meant to enjoy and love, it is a gift...productive outlets right now are very important for you.
Come into this forum when you need to, to vent, and allow these ladies to comfort you and offer some supportive suggestions which may help. This is an excellent place, I'm glad your here....
Take one day at a time...