I think it's just first day nerves, everbody gets that even non-emets who don't have all our anxiety issues! It wouldn't be natural to be starting a new job and not feel at least a little nervous.
The night before I started my last job I got myself so worked up and anxious about everything I actually spend all night v*ing. I had no sleep and felt like absolute s***, but I went in anyway. As soon as I got there I settled down, the anxiety nausea vanished and at the end of the day I felt so proud that I'd gone through with it despite suffering so much the previous night. The anticipation of the event is always worse than the actual event! I worked myself up into such a nervous frenzy and when I got there things were fine. I'm sure you'll be just fine too.
Good luck, let us know how your first day went!
.•:*¨¨*:•.Tracey.•:*¨¨*:•.
Fall seven times, stand up eight.
- Japanese proverb