When something like that happens I don't try to rush things because everyone depends on my work at that moment... I take a deep breath and smile then I take my time to do a good job... I understand this because I go through it a lot in the office, I was feeling bad then but now I don't feel so anymore...
My boss told me something that have me courage to work better under pressure, he said if everyone is waiting for you, just know you are very relevant and believe in yourself, it shouldn't make you fear rather it should make you proud...

Just how I see it, I don't know for others...