Yeah, brought back a few memories for me, too. With my first husband, who was already a drunk when I met him in college. Usually his anger was directed at himself, rather than other people, but it could still get scary, and he, too, got a lot of injuries when he was drunk.
After college, it got unbearable for me finally, and we took a break from the relationship. He got sober, and has now been sober for 35 years. If he hadn't quit drinking, I doubt he would have made it to the age of 30.
All I can say is that this WILL get worse over time. It may be hard to imagine, but that "nice guy" you see part of the time will eventually disappear altogether.
I suggest you get going to Al-Anon. It can help you get your head clear so you can make good choices for yourself. Sadly, unless your boyfriend decides he's had enough, you don't have a rosy future with him.