Well, it's good that they are onto it at least Sounds like you have a pretty cluey doctor, because a lot still don't often think to test for coeliac disease.
Don't worry about the biopsies, they aren't too bad. The worst part if the awful drink you have to have to 'clear out' before hand . Other than that though, it's just like having a sleep and you shouldn't be in any pain. They usually only use light sedation not a full general anaesthetic.
PM me if you ever want to chat.