Ive been through 2 endoscopies without sedation and suffered from severe anxiety at the time. They both went smoothly although werent pleasent. They only last a few minutes, i just focussed on relaxing my body and breathing slowly, this also helped me not to wretch so much as the tube goes down the throat.
If you are worried you can always choose sedation, then you probably wont even feel a thing.
I think of it a bit like childbirth, ok its not pleasent, but if it was that bad people would never have more than one kid :p so the fact I had 2 without sedation tells u that it isnt that bad :) literally only 3 minutes of the strange sensation of someone poking around inside you
GERD, Anxiety, Depression, Rolling Hiatus Hernia, Esophageal Hypersensitivity