One thing that can greatly improve a nervous flier's flight is to make themselves as comfortable as possible. One of the things I would suggest is to invest in a good pair of noise cancellation head sets from a company like Boise. They do a good job in providing comfort,& reducing noise to a minimum. You could further reduce your anxiety by picking a good seat that gives you comfort. Depending on the airplane type, that could be first class, emergency exits, bulk heads, or the rare. Once you are seated get a blanket quick because they go really fast. Then, turn up the air vent fully open so you are getting plenty of air. People who are well cooled will not dehydrate.