If you can stomach an apple eat one before you go. They give you as much energy as a cup of coffee would. Also take a nice nap when u get home
Good luck Im 9wks and 5days and had an Apple on Monday and the vomiting suddenly began lol & I was perfectly fine before the Apple. Not saying it will happen to you but I think we are all safe on Lots of water, our prenatals and small snacks that you know for sure doesn't upset your stomach.