My daughters boyfriend hit her. When I found out, I beat him up when I was drunk. My daughter got injured trying to stop me, now I have lost her and my son's love. What should I do ?

Your daughter is stupid to be with a guy who hits her,, then again,she is stupid trying to protect him,, talk some sense into her,, but 1st apologise to her for injuring her, though unintentionally.
Last, STOP DRINKING...