history:  I have to go to a company presentation and make a speech. I'm so nervous that I might mess it up In a few days I need to go to a company presentation and make a big speech! Wow_comma_ I bet that's exciting_comma_ but also makes you a bit nervous. Congratulations though_comma_ I'm sure you are proud to do it!
current: I am! But, yes, you are right. I am extremely nervous about it. What if I mess up!
next: Well, I would probably feel the same way, but I'm sure you will be great. If they didn't have confidence in your abilities, they wouldn't have chosen you to do it!