Keep in there. Most all of us have had absolutely awful, embarrassing situations like this happen to us, but maybe not quite always as severe. Being humiliated like this is always very hard. I know this may not help much, but try not to let it get to you too much. At least you have a friend, try to take consolation in him if possible. I've found opening up to my close friends about the problems and anxieties my stuttering has causes has helped greatly.