I know that you are sedated during n endoscopy but do u feel the tube going down your throat?

No. when you get sedation with anesthesia thru the iv you will not feel it.
Nasal? Do you mean nasal endoscopy? Let us know. Nasal or nasopharyngeal endoscopy can be done under local analgesia with a topical nasal spray and you would not feel anything except a minor discomfort if there were a deviated nasal cartilage. One is not sedated for nasal or naso-pharyngeal laryngoscopy. So please be a little more specific by the term n endoscopy.