Once you dial 911 isn't there a permanent record of the call? you called twice. What did you mother do after he pushed you into the shelving? isn't she a witness on your behalf?
you need to remove yourself from this volatile situation now, because he is going to get even more drunk and vicious today....if you don't want to go to a DV shelter and feel you can't stay with mom with your kids, take them to a nice hotel with a pool.