Theres no such thing as hypnotism as people think there is. Its simply a placebo that allows people to do things they want to. Power of the mind.
In case of fears of flying or anxiety its very simple. As long as you think it might work then you go in hoping it will. YOu are say, scared of flying, but you REALLY don't want to be. you simply need an excuse to not be scared of flying, thats all "hypnotism" gives you.
Same with anxiety, you don't want it, you want to believe anything can cure you. AS long as someone else has helped you believe it can work your mind simply uses it as, i guess a cover story allowing you to think you won't be anxious anymore.
THats all there is to it, thats all there is to a lot of fixes. Not sure if i believe it or not yet but a lot of people for instance are now questioning of anti-depression meds are doing anything in reality or are just working as a placebo effect. I guess its impossible to know. Its been shown before that in the same way someone with pain thinks he's getting painkillers the pain may go when he just gets saline. The opposite is true also, even if someone is getting the real pain meds if they are led to believe they are getting a placebo then the pain may simply not go away.
So now Prozac(the biggest anti-depression drug people think might just have placebo effects now) might decrease in usefulness as people start to think its just a placebo, but is this down to it really being a placebo and the placebo effects not working anymore? Or is it down to essentially increased resistance of people who think its a placebo and it not working as effectively.
Thats why hypnotism couldn't be "disproved", at least not for 50 years and some breakthrough in brain medical science that would allow us to know when someones thinking something subconciously and to determine if a scan can see if somethings a subconcious effect(placebo) or a real effect.
This is why hypnotists that go to say clubs or whatever, comedy nights, they pick on the most gullible looking people. who are they? the ones that follow every latest fashion fad are fairly obvious as people dictate to them how to dress. People that are obviously trying to fit in, a good hypnotist is good at reading people mostly. The guy that came to our uni picked 6 people of which i knew 5 and they were the "needed, loner, want to fit in" types and 4 of them were wearing every cliched "cool" thing in fashion at the moment.
Every person who believes in UFO's and every other ridiculous thing around believes in hypnotism, and every sane level headed non gullible person i know doesn't believe in it.