abcxyz,
Read Erin's article on the death of her boyfriend. Try to email it to your friend to read. It might even help you get a perspective on your friend and her actions.
The Death of My Ex-Boyfriend
Friendships are relationships. Just like it would be a relationship with a boyfriend. You care about that other person and their well being. Fights and arguments occur. Frustration arises. Your frustration is stemming from you trying to control your friend, to have her see things your way. Only she is in control of her life and hopefully after, or if, she reads Erin's article she will have the courage to change. (if what you say about the boyfriend is true)
As for your behavior while you are parting your ass off. Are you bragging about it or are you trying to use it as an excuse for your emotional outbursts? What do you want to hear? Us telling you to stop the excessive drinking and self abusive behavior. Do you like puking your guts out and waking up strapped to a bed? Do you like guys screwing you because they know how loaded you are and are probably laughing at you all over campus?
This is a personal development site and you posted on it. Do yourself a favor and take a long hard deep look at yourself and decide what path do you want your life to go on.
I truely hope you can get your friend to read Erin's article.
Good luck to both you and your friend.