hi rom, i am terrified of flying so i understand where you're coming from. I put it off for years but i thought it was something i had to do if i ever wanted a holiday abroad. I flew in 2001 and i didnt enjoy it and we were away on september 11th so that didnt really help my fear either! lol I flew again last year and it was a great flight and went a fair way to easing my fear.
My point is, once you do it , you will maybe wonder what you were so scared of. I would agree that you must tell the dentist your fears, he will know how to handle the situation as im sure you are far from alone!
Good luck! Jules x