Hello. Thank you for posting.
*Some things that may help.
Chew some minty gum and focus on your breathing: the action of chewing stimulates digestion and relaxation. Mint flavoring (in moderation) also has a soothing effect on the stomach, alleviating the sensation of nausea and indigestion.
Try to take slow, deep breaths to ease yourself to sleep if you can.
There are various commonly-used, over-the-counter drugs for airsickness, including antihistamines, which you should take half an hour before the flight, and the Hyoscine patch, which you should place behind your ear. There are also some very effective natural remedies for airsickness, such as ginger, which is widely believed to have an anti-nausea effect. Lemons contain citric acid, which can calm the stomach and prevent vomiting.
More tips here, copy/paste the link: https://homeremediesforlife.com/motion-sickness/