Hi ! It could also be due to migraine
if you are a known patient of this condition. If not, please do not discard the situation as a migraine. It could be some kind of infection in the intestines and stomach, if you had some food from outside recently. To have an exact idea, you need to be examined by your family physician specially because you are going to travel. So, it is better to be sure before you go out of town. Good luck.