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Remind yourself how wonderful travel is and how life enriching it is. I like to pull out pictures of my travels in the past to remind myself that I have done this before and I can do it again.
Dont workout or drink coffee the day of you flight, eat something but make sure it's low in sugar no orange juice toast and peanut butter works for me. Make sure you are ready and dont rush. Tell the flight attendents about you concerns and talk to the pilots.
Don't let negitive thougths over ride the facts about how safe flying is.
I fly to St Bart tomorow June 4th and I too am felling jittery but I know we can do this.