Sending you a hug.
Three weeks is NOTHING except the start of a start.
Your instincts are to protect yourself and your children from any more chaos and you should listen to them, yes? And you have a right to how you feel and to have the time you need to process what has happened.
If he's serious about recovery he will respect your wanting more time. If he has a fit...he's not serious, he's just staying dry long enough to get back to the status quo.
Think months, not weeks. A year, even. It's one thing if it were just you but your boys do not need to witness him verbally abusing you.
Do you have access to some counseling or Alanon?
Have another hug.