Blair,
Having been around the block already, you know that the anxiety you're feeling is quite normal. Of course you feel ready to jump out of your own skin. We all did, just as you did once before. Add to that your finals, your doubt, family problems and anything else going on in your life and you're plate is beyond full. That which doesn't kill you only makes you stronger and that you're still posting proves you're still alive, therefore, you're getting stronger by the day.
You have a lot on your mind which is actually better than having to dwell on your upcoming surgery alone. Having 'dwelled' on way too much my whole life, I've now decided that if it isn't important tomorrow, it's not important today. The more I remember that, the happier I am.
So stay clear of your brother, dismiss the negative posts, concentrate on your finals and look forward to May 11th. It'll all be over by then! Above all... don't forget to breathe
Hang in there, I have a feeling you'll do great, Dale