I agree with what everyone said above... I have a nephew that adores me and he saved my life exactly in this way. He doesn't even know it, but I came so close to killing myself about 6 years ago.
It was the thought of what it would do to him that stopped me, nothing else. 6 years later I am glad I didn't do it. He saved my life. Your children are saving yours, and you will be glad one day that you chose to stay. I know it doesn't feel that way right now...
My heart hurts for you and what you are feeling right now. Please keep coming here for support. Sending you LOVE