I need someone to talk to me, I am stuck in an overwhelming, anxious loophole

I am taking a 4-hour flight tmrw after 13 years with school acquaintances, and I cannot stop thinking about worst-case scenarios. I was 8 years old last time I was on a longer international flight, and I was fine going there. But when I came back for some reason, I got nauseous on the plane (I think it was turbulence or plane food. i also had motion sickness as a kid that i outgrew.) I did not get sick until I pulled up to my driveway. I know that was a while back, and my body is older now. What if I get horribly sick on the plane (i have emetophobia) or have a panic attack in front of everyone on the plane? I cannot escape from an airplane, obviously, so now I'm thinking what if something bad happens on the flight. I know this is very irrational of me to think this way, considering that air travel is safer than car travel. I just don't want to get nauseous and sick on the plane in front of people. I just want to survive this 3-day trip without getting sick or insanely anxious. I was so excited for this opportunity a few months ago, and now I'm dreading everything about it from the minute I wake up at 4 am tomorrow. Please give me your tips on how to feel better. I feel very overwhelmed.