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How to travel when you have an anxiety disorder
Make a to-do list.
Packing at the last minute can be a source of considerable stress that starts off your journey on the wrong foot. Have your bags ready to go the day before your trip.
You can also make a list of items to be packed before doing the actual packing or pack slowly over a few days rather than all at once. Separate things you'll need to keep out between the time you pack and the time you leave like a toothbrush.