I had the same experience as you when they shoved the tube down my throat. The worse procedure ever and when they removed it, yellow juices were oozing from my mouth and I laid there face down as though I got tortured badly.

My first endoscopy, I was also sedated in Pantai bangsar. But I woke up while they had to scope down my throat and I fought for 2-3 secs before I passed out again lol.
I wonder why some will be sedated and others they're not