Thank you so much for your advice, Mowgli & JoePianist! It's very nice to know that I'm not alone in this :-)
Please let me know if you happened to think of other ways of relieving stress, I will do the same too! What I am doing right now is trying to take the perspective of this event being an opportunity for me to evaluate their program as well, rather than me being the only one evaluated. I think that helps a little...
Good luck with your interviews!