Hello @thrombomom14, Welcome to Connect. I did a search of Connect and was not able to find any members who have posted about a double-balloon endoscopy. I was able to find an article that may provide some information that is helpful.

Double-balloon endoscopy in the diagnosis and management of GI tract diseases: Methodology, indications, safety, and clinical impact:
-- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4088048/

There is also another discussion you may find helpful here until we hear from other members who may be able to share their experience with a double-balloon endoscopy.
-- Colonoscopy and Endoscopy: Preparation: https://connect.mayoclinic.org/discussion/colonoscopy-and-endoscopy-in-rochester/

Are you scheduled to have a double-balloon endoscopy?