The endoscopy is not at all painful and very worthwhile. They would normally take a biopsy (while they do it) to rule out anything sinister as well.
Do you have any symptoms other than the chest pains? For e.g., overproduction of saliva (water mouth) or heartburn?
Is it lifelong? - I sure as hell hope it isn't, but I'm not controlling most of my symptoms at present.
Good luck and God bless