Interview nerves, what actually helps? after 4 years as a copywriter

I have an interview on Friday and my stomach is in knots. It has been weighing on me all week. I want to come across as confident and honest. Any questions to ask at the end?

Arrive early, drink water and take a slow breath before you walk in. It sounds simple but it helps.

Prepare three stories with a clear beginning, action and result, and adapt them to the questions.