I'm doing my first, dreaded long haul flight in 3 years. I will have my older sister joining me (we're both adults) but she's never experienced my anxiety before. She said it would be helpful to tell her a few things to prepare for - like what responses I would like if I do certain things. But I'm not sure how I can prepare her for anxious me. Any ideas or resources to help her in understanding?

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I'll be extremely on edge and will be very motion sick and uncomfortable. What if I have a panic attack? What if she regrets agreeing to sit next to me?