Traveling should be fun and not worry and trouble. So, before setting off for a journey be sure about the following.
-Your passport is up to date. (What shall you do if it expires the day you are flying off?)
-You have called the airport to verify you exist in their computer system.
-You bag is packed and nothing is left for the last moment (better buy a new toothbrush in order not to loose the old one in all that pre-traveling haste).
-If you're carrying stuff with batteries pack it with the batteries out. This is especially safe of alarm clocks. Don't give some poor security guard a heart attack.
-If you have a kid, take some book or game that will entertain him during the flight. Kids are mysterious creatures, better busy them with something in order they do not imagine themselves flying a fighter jet
-Get to the airport on time. (Not the least thing, by the way).
If you are afraid that you may feel bad on board, better visit your doctor. He will probably give you some special pills and definitely some pieces of advice (you can only hope both will help). Then, there is one more thing that may help you feel comfortable in the air - avoid caffeine and carbonated drinks, which can make you feel bloated.
Motion sickness is caused in part by a discrepancy between what you see and feel. (A car driver gets sick much less frequently. He is continuously watching the road, getting a good idea of what is coming next.) It may help to close your eyes the moment you start thinking about getting sick.
Also do not be worried about your oxygen. Keep in mind that airlines provide oxygen only while you are sitting in your seat, not in the airport. Thus, a non-stop flight is your best option. If that's unavailable, look for a direct flight where the plane makes scheduled stops but you may remain on board. All airlines require advance arrangements when you're traveling with your own oxygen equipment. Call the airport at least a month ahead, so you'll have time for your doctor to complete any necessary paperwork. If the ticket agent can't answer all of your questions, ask for the airline's medical or special services departments.
One obvious problem that you face when traveling by air is lack of space. Though, this does vary from airplane model to airplane model. If you travel a lot, try different airlines and airplanes to determine your preferences.
If you are very tall, you may prefer an aisle seat. This will give you a chance to stretch your from time to time. Even better is to get a "bulkhead seat": there is usually more legroom in those positions. Those seats go quickly; so it pays to book ahead.
When you travel without a companion you are bound to get into conversation with a near seated stranger. Unless you travel with a mouthful of water. If you a nervous person you better have someone to accompany you, because the better you are acquainted with someone, the harder it is to have your "personal space" violated.
At last you have got on board and the plane took off. Enjoy yourself and leave all your problems beneath. You may have a cup of coffee or tea, or some juice while reading. Dozing or resting your eye on the clouds under the wing is also relaxing. It is all good of course but what about a meal (especially if you had no time to though a sandwich into your mouth)? The food on airlines may not suit you (this is not a restaurant, guys) but is at least eatable. Though, if you have some dietary preferences, you should have mentioned them in advance to your travel agent. In this case the airlines will usually accommodate you.
If you have food allergies, you better bring your own food with you. (If you are a fussy eater, do the same, otherwise you will tire out the stewardess with your pretensions). Take care: many countries have import restrictions on foods; be sure you either finish the food you brought on the plane or make sure it will pass through the customs.
Many people have a fear of heights. Furthermore, for many people, not having any control of the plane makes the fear worse. This is not necessarily a rational fear, if looked at in the context of all possible hazards. Even if airplanes flew like bricks, the plane would cover quite a few horizontal miles before falling. But planes are not bricks. Furthermore, commercial jets always have at least two (and usually three) engines. The chances of two failing simultaneously are very slim. So relax. If you are still afraid of that iron flying monster, join the ranks of thousands and do what they do: get drunk before you get on the plane. Either travel by train bus or car (why do you think it is safer?). Or rather, if you are such a coward, stay at home and round yourself with cotton wool and sit in a safe.