Don't be scared. I had one a couple of years ago for stomach pain. My friend had had 3 in the past and told me to go for the local anaesthetic but I decided not to and just go with the procedure. I laid on my side and they slowly feed the tube down your throat telling you to swallow as it goes. It isn't that comfortable, naturally, but it went okay and it's a weird feeling when the tube is 'exploring.' It didn't take long. I would have felt nothing at all had I opted for the anaesthetic so just go for it. The staff are very well trained and gentle. They found nothing wrong which I hope will be the case for you.