It's so nerve racking to think about it. So nerve racking that you think that one word would shatter you into a million pieces and fling each piece off into a different direction so you can't pick them up and start over. It's so nerve racking it's terrifying and you want to run away; crawl away. Whatever it takes to get away!
It's so nerve racking you want to hit something—and hit it hard! You want to pick up the nearest heavy object and throw it across the room, but at the same time you want to cuddle something soft and hold onto it tight.
It's so nerve racking it scares you. It's so nerve racking you want to scream and then laugh and then scream again!
WHY does it make someone so nervous just to say 'I love you'?