I recognize that you are panicking about our upcoming trip to visit Mister Curie's family. I also recognize that my having OCD means that I am more prone to panic attacks. However, must your stress response take the form it does? Really, I can think of no situation in which GI complains, acne, severe eczema, hives, tachycardia, and high blood pressure really do any good. Unlike my cavewoman ancestors, I am not being attacked by cheetahs. No amount of fight or flight would fix this problem.
In other words, knock it off. I have a 6-hour flight tomorrow, and I don't need to be running to the bathroom, itching, and hyperventilating the entire time.