Sorry for the buzzkill..
If it makes you guys feel better, I coped in an incredibly immature and satisfying way... She didn't know this, but I had to pass by her house every day, sometimes several times per day for work. At first it was really hard for me, and I would get upset and mad at what happened. So I started honking obnoxiously every time I passed by. She didn't have a job, so she'd sleep until 1 or 2 in the afternoon, and I had to be at work at like 8:30, so if I had the potential to wake her up multiple times per day, it was a great day for me. I never told anybody about it, because it seemed pretty childish, but it made me feel better to wake her up or just generally annoy her on a daily basis, considering she couldn't be bothered to wake up and take care of my dying brother. Now I can drive by her house without getting upset, and honestly, when we talk about my brother now, I don't focus nearly as much on what happened that night and I've let go of a lot of anger. Maybe it's just been the time that's passed, but maybe the honking helped too.
I was driving with my best friend a few months later, who knew where my brother's house was, and as we start to pass by and I get ready to honk, I tell her, "Hold on, we gotta pay the Troll Toll. FYI: troll currency is obnoxious honking." She has the same sick sense of humor as me, so she was pretty pleased. I'm probably going to hell, but eh, God has a lot of shit on me anyway.