If he is at the same hospital as my BIL was, he is getting amazing care. They saved my BIL's life a couple of years ago, brought him back after a heart attack (he died on the table). So, you should feel confident that they are doing all that they can.
It is totally all right for you to be angry at him. What he did was incredibly short sighted and selfish. I am sure that he was in a lot of emotional pain, but his act will have ramifications that will be felt for years. You can be angry, you can be sad, you can be frightened - you feel however you need to right now. But, don't you dare feel guilty. This was not preventable by anyone except your brother. If someone had been there, he would have just put it off. It was obviously thought out.
Most of all, I am just so sorry that you are going through this right now.