Esophagogastroduodenoscopy (EGD)...What?

About a year ago I started having really bad pains (comparable to child birth) in my stomach. I lay on the floor and try not to move because it hurts so bad (and the cold tile would help too). It causes nausea, vomiting & other gross stuff. I went to the Dr. and he sent me to get an upper GI (x-rays of my stomach sort of). They determined that I had acid reflux, but they didn't see any ulcers. The Dr. gave me a Rx. Now about 6 month later my flare ups are getting worse & I have had other symptoms that are even grosser. So I called my Dr. and he referred me to a G.I. specialist. So... this Thursday I am to going to get an endoscopy. Basically the Dr. is going to stick a tube with a camera down my throat to look at my stomach and esophagus. He will be looking for any small lesions like ulcers. While they are in there they can do biopsies & treat certain things within reach. Hopefully they can take care of whatever is going on inside my stomach so the pain will go away. Wish me luck!