What does an endoscopy (sp?) feel like?

I have to go have them look down my throat because I mentioned I have heart burn now and again and I was wondering what the test felt like and how long it takes? I have a super-over-active gag reflex. I can't even suck on a lolly-pop without gagging. How big is the camera? Like a pencil wide or more like a magic marker or (gasp) even bigger?????? I'm freaking out. This is (GOD WILLING) the last test I have to take before getting approval.

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