Evelyn, I know exactly how you feel because I went through the same thing just couple of weeks ago. I was scared to death about my symptoms and terrified of the endoscopy. Everything went ok and I was diagnosed with gastritis, possibly caused by h. Pylori. After knowing why was feeling so horrible, my anxiety started to subside bit by bit. Now my appetite is almost normal and I am much better. I am not 100% by any means but it did get better. Chances are things will get better for you too.
Dont be scared off the endoscopy. The peace of mind you'll have afterwards can do wonders. Good luck.