Julie-I agree with 3 and labug. What a tough situation. Certainly you don't want his rock bottom to occur when he has your son. I am feeling for you.
It isn't exactly DBing, but I think you need to go into protection mode for you and your son.
Maybe getting your H out of the house will be real 180 for you and eye opener for him? Scary decision to make, and he may not handle it well. Take care of yourself.
Me:33 H:35 M: 12 years D-15 S-6 Bomb: 6-2013 OW: 11/2013 Kids and I moved out: 11/2013 when he continued to lie about affair Kids and I moved back in 12/2013 H moved out 2/2014