I haven't heard anyone mention it here before but that doesn't rule it out. I had a similar test once where they put a camera down into my stomach to check for ulcers. I was sedated but semi awake. Not too big a deal at the time but I was quite a bit younger. The thing looked about 4 feet long and was about as big around as an average size pen. I wouldn't be too scared there are other tests that are less fun. Take care.
I too have had the scope down my throat to check for the ulcers and the thyroid area. When i had mine i was put completely out. Don't remember a thing about it and there was no pain. Hope this helps ease your mind.