Meditation. If you prefer not to medicate, then you can just meditate. Meditation makes use of self hypnosis so you can calm your mind down. You can meditate on self hypnosis scripts designed to ease travel anxiety. Hypnosis scripts are available online, so you can invest in some subliminal CDs. You can even bring it with you on your trip.
Attend a hypnosis school. You can train yourself how to do hypnosis, but the self-learning is a lot faster if you have a little background about the practice. You can take a short course in a hypnosis school. With thousands of schools in the United States, and worldwide for that matter, finding one shouldn't be trouble.
This can be pretty hard particularly if the subjects are things you are not truly interested about in the first place, but you can still do something to make them more exciting. If you sort of audio subliminals hate science you can conduct your own experiments. The exploration can make learning more intriguing and interesting. You can also comprehend the subject matter on your own way.
If you're striving to attain any goal at all - find something in that goal that is measurable. Measure the subliminal CDs hell out of it. Seek to improve... all the time.
But if you believe in success, any small detail, like losing weight successfully, will be used as further reinforcement of the belief that, yes, indeed, success is still possible.
Backwards tracking works this way as well. You are not able to understand what the backwards tracked message is actually saying when the music is played. However, if you were to play an album or song that included backwards tracking backwards, you would be able to understand the message.
If you are struggling with success or behaviors that create nothing but undesired results, then consider replacing those self defeating habits with images that change your subconscious mind. And once your subconscious is changed, your entire life will too!