I'm probably too late to offer this advice, but I find scheduling a lot of interview helps with the stress. There's still gonna be the one you REALLY want, but at least you just have to deal with a bit of performance anxiety, as opposed to "how long before I end up living under a highway if I don't get this job". Plus, you can schedule some of those other interviews prior to the important one for practice.
Here's some tips that I hope you'll see before the interview: seems to me like you've had a solid career, you must be good at what you do. Just keep that in mind, sell your skills, and forget the whole social aspect. For me, it really helps to treat it not as a conversation but as a series of very short monologues about me in response to questions. It's the exact opposite tip that you'll get form professional placement firms, but I found it works great for me.
I just sit squarely, but relaxed, in my chair, look at the interviewer only when I'm talking to him (which is not ideal, but it helps me manage the complex art of NT eye contact, the details of which escape me to this day). Try to talk about your proudest works and professional accomplishments, NTs don't always get us but they get passion and they love it.
It may be worth noting I work in IT, so one might argue my social skills are not really relevant to the interviewer and some of my tip may not be relevant to your field, I'll leave it up to you to judge.
Final thought: Sun Tzu is often quoted saying something along the lines of "know your enemy and know yourself", but if you've read any of his translations, you'll note he makes a much bigger deal of the "know yourself" part. Know your weaknesses, and develop strategies to make them irrelevant or exploit them as strengths.