6weeks & flying internationally??

So i’m 5w5d today & i’m flying back home (aus) from the U.S in 6 days. I flew here a week ago and I was fine, got a little bit sick riiiiight at the end when we were landing. But now my morning sickness has gotten a bit worse to the point I can’t always finish my meals although I’ve had 2 bites because it makes me nauseous. I’ve been feeling SO much more tired the last couple days no matter how much sleep I get 🙄. My question is how can I help my morning sickness on the plane?? Also do you have any tips to sleep better on the plane? I slept like 30 minutes if that on the way here & it was a 12 hour flight (from New Zealand)

Thank you in advance, any advice is really appreciated x