I'm not sure what options u have about that... I get overstimulated too in situations like that and tend to shut down because I'm overwhelmed. Will u be flying alone? If not, then maybe whoever is with u can hold u hand as a way to focus. Planning ahead always helps to make things as less stressful, so buy your ticket ahead, check in online before u get to the airport, etc. not much else u can do tho about security, etc. if u have a t, I would run through it and envision it as much as possible beforehand. Also, can u take something? Xanax? Ativan? Something to take the edge off?