Please start at least taking the steps so if you have to flee on short notice, you're ready. The DV counselor can help you with safety planning. There are checklists--copying the important paperwork, leeping an overnight bag with essentials at the home of a trusted friend, having a cell phone on you at all times with 911 programmed on speed dial, putting a spare car key and a few dollars in a hidden place by the door or right outside so you can grab it if you have to, etc.
The others are right--he is using your family as an excuse for his drunken rages, which will continue the first time you do something that displeases him. It is scary to think of what might happen when you are alone with him and he knows there are no witnesses or anyone to interfere.
I'm glad you are planning to stay in touch with us. Swear to yourself you will make that call tomorrow.