I agree with Chicory. It is terribly sad, this situation, addiction usually is sad, and we all feel the pain in your heart.
But the pain you feel is felt 10 times more by your children, because they are not in a position to do anything about this and they too are in danger when your wife gets on her pills.
The only safe place for your children is away from her. That's a hard thought to process but it's the stark truth here. They live in a house of active addiction and abuse. Thank goodness the little one never found pills laying around and thought they were candy...that's another scenario that plays out far too often in situations like this.
Leaving with the children would mean changing your life, your working hours perhaps and where you lived. They would need some kind of good care while you are at work. But it can be done, mothers and fathers here have had to do it to ensure the safety of their children.
There is nothing you can do to change your wife, or even save her, sadly. But you can save your children and yourself from a life filled with danger and drug addiction.
My prayers go out for all of you, this must be terribly sad and scary.
Hugs