Endoscopy on my 9 monther

Hi, I saw the Gastroentologist(?) and he has put my 9 month, she'll be ten months, through for an endoscopy. I came away thinking I can get some info and cancel it if i don't fancy it as he almost gave me the choice. Has anyone else's baby had one? Im worried about the anaesthetic. also has anyone any experience of a stomach biopsy? what might he be looking for? I know I should have asked him but we've had a few problems with Mia and I get anxious! thanks