Hi welcome to HCM. Travelling is associated with significant bowel disturbances and diet changes. You seem to have disordered stomach motility leading to process of indigestion and dyspepsia. This can be controlled or prevented with the help of low fat high protein diet preferably liquid diet should be adhered to while travelling. In case of relapses of such symptoms I advise you to have an ultrasound of your abdomen to rule out organic pathology. In most cases symptoms resolve by itself. Drugs like proton pump inhibitors and prokinetics will be pretty helpful to improve your symptoms. Avoid junk food whenever possible. Bedtime oatmeal will help to soothe your gut. Drink plenty of water before your flight travel to avoid bloating sensation. Consult your gastroenterologist for further queries. Thank you.