just read the whole thread andwhilst you are obvisouly not in a good place at the moment, only you can change that.
Firstly, you need to take all the positive things in you life and hang on to all of that. You have a DH who loves you, and cares for you. You have those little DC who love you and need you. That is something that you will find you have that many others on here don't have.
Remember that when you feelo you need to end it all. Your DH has been a real brick, many men would have walked away. Your DC are healthy. Be thankful for that.
As cyteen speaks from experience, and I admire her for posting on this. The DC will NEVER EVER be better off without you. Do not think otherwise. Did you say 20 years on Cyteen you still are suffering from the effects of what happend to you .
Remember your Nana, how you felt when she was taken from you Muffin, the loss you feel and this was when she had no control over her death. Would you really want your DC to go through all that, knowing you had a choice?
I am posting this purely to help you see reason. Nothing else. Please take on board what others have said, and remember all the above when you feel there is nothing to live for.