I had an endoscopy in Deceraber - the week before Christmas - without sedation, and it was a bit uncomfortable at first, but wasn't too bad after that (and I got to see everything on the monitor throughout the procedure which was kind of interesting).
The doctor knew I didn't want the sedation (because of a family event that evening) so he used a pediatric scope (which is only an option if he doesn't plan on taking a biopsy), and the whole thing took less than 5 minutes.
If you don't like being put under, you might ask if that's an option for your procedure.