I'm sorry this happened, but I have an anecdote that might cheer you up. A friend was flown out to Silicon Valley and put up in a hotel after completing their p

I'm sorry this happened, but I have an anecdote that might cheer you up. A friend was flown out to Silicon Valley and put up in a hotel after completing their programming challenges. He was rejected because of just how bad his anti-social mannerisms were. Well that hurt him a lot, but a few months later, he did find a job. If your speech is the type of thing you can work on, work on it. If it is something more medical that you can't control, think about mentioning it up front. I'm sure you'll get a job in a month or so if your technical skills are there. Don't sweat it, even if this seems is an utter kick in the gut.