Good luck with the endoscopy. I did one recently. It was a weird feeling because I wasn’t even knocked out when they put the scope down my throat. It didn’t make me gag or anything (because the meds the give you via IV turn off the gag reflexes), but I felt it go all the way down and hit my stomach. Then I felt them turning it. I thought it was funny for some reason, as it kinda tickled, but then they turned up the anesthesia and I got knocked out.