My best friend's in the hospital... what to expect?

So my best friend and I were dating for a month before we both mutually decided to break up... neither of us felt all that upset or anything. We were still just as close as ever. The next night he got in a severe car accident. He was driving with his sister, and the next day she ended up dying from the injuries. I was with him that night, with a group of friends, because the doctors wanted us to give him stimulation to wake up. So we were all calling for him to wake up and stuff, but he was on too many drugs to open his eyes... but we could tell he was -there- from the way he squeezed our hands and scowled in concentration. Now he's in stable condition and waking up on and off, and even shaking or nodding his head in response to questions. They're planning on taking his breathing tubes out soon, and then move him out of the ICU. His MRI results came back... he has a tear in his frontal lobe, which is the part of your brain that controls personality and stuff... So I'm just wondering what to expect. Keep in mind, he also lost his sister, and he was driving, so there's going to be alot of guilt I'd imagine. This kid is one of the strongest people I know, and we are super close, so I just want to know from people who know what they're talking about... What can I expect in the next few months?