I've had a similar situation before, only I ended up worse off.
I ended up getting absolutely hammered, the last thing I can remember is walking then I was being dragged up the road by my mates with my shirt covered in blood. I had no idea what had happened, I had to be filled in about it all the next day, turns out we got jumped and I got a bit of a kick in.
Anyway, my dad picked me up and I had to go to hospital for scans and stitches, I got home at the back of six in the morning.
I felt shit. I wasn't hungover, but I knew I'd let my parents down badly and put them through hell ending up like I did. I still feel ashamed of myself that night to this day. I should never have drank so much in the first place and I paid a huge price for it.
I will never, ever do that again.