well, i wish i could tag along to be help, but the best thing to do is hydrate. i don't know what you take for yours, but now when i travel by air, i always have an imitrex in my bag, my own pillow and scarf to try to sleep through the flight.
hope you have a lovely flight and time there.

When I traveled to Europe I went to my doctor and got a sleeping pill that would knock me out on the plane. It worked well and I slept for most of the flight. I arrived able to interact and not wiped out. So you can give that a try. Hugs, Cathy

Have you looked up jet lag on the interweb?
Hubby used some diet to help when he went.

Good luck

From one road/air warrior to another- I feel your pain. My old doc used to tell me to take an ambien and sleep off 8 hours of the flight. But b.c I loved the "shows" in Business First on Continental (slippers, comforters, 7 course meals, on-demand films and tv shows/games, flat bed seats, etc.,) I never wanted to miss it all. I would take the pill too late, fall asleep in the middle of a great movie and wake to them serving breakfast before landing.

I tend to get migraines when traveling and I ask people around me (if it is a day flight) to keep the shades closed. You can't see anything but clouds anyway until take-off or landing, and it makes it a nice dark, quiet place where most ppl sleep or watch the tvs. Make sure you get a window seat so you control the shade and bring sunglasses with you.

If at ALL possible, upgrade to 1st class/Business Class. Sometimes they offer last-minute deals for great upgrades, or deals using miles. If you are comfortable on the flight it'll help when you get there.

Good Luck- I miss Europe! Wish I was going, too! ;)
Stay safe!
Jen