I get nauseous when nervous?

It sounds like you may have an anxiety disorder. Sometimes anxiety just doesn't make sense when it happens. There's no reason or rhyme to it. I would see if you can go see a doctor...if possible before the trip. If not you could take something to curb the anxiety. I take valerian root when I feel anxious. Valerian Root is an herb that calms you down. It has no side effects except maybe a little sleepiness, but not enough to make you a hazard or anything. Make sure you take 2 or 3 pills and drink a glass of water with it. Also you may benefit from taking something for nausea, ginger is really great for nausea. You can try crystallized ginger, which can be found in the spices section of your grocery store. Also they make really good ginger candy that can be found in organic stores. Most importantly though, see your doctor...even if the Valerian Root works. Make sure to take care of the underlying issue, whatever that might be. Hope everything works out for you!