I know it sucks....no doubt about it!! You are being so strong and I think you are there for him as much as you can be.
It is really hard to leave your loved one in the hospital. I know what it's like to wish that you could take their place.
Keep your head up and think positive thoughts about him getting better. Just imagine all the cool things you might get to do when he is thru all of this horrible stuff.
I am thinking of you and your bro!
BJ