Find a way out, for the children! Never mind your self right now, they NEED to be in a healthy place, and they know so much more than you think, what they don't "know" in the adult sense, they experience in ways that will affect them the rest of their lives. They need to know the truth, and that they have a parent who will protect them from danger and give them the attention and love they need...
You cannot even help the addict by staying trapped.