I have been working in the same company for 20+years gaining 1 promotion in this time. Recently a further promotion came up and applied. Had an interview and it was disastrous, couldn't answer any of the questions and was physically shaking. Haven't got the job, which in theory I should have as I am so well experienced and could do the job very well. I'm so embarrassed that I was like that. Should I apologise to the people that interviewed me as I proper screwed up and coukd see their disappointment in me.