The possible issue with these procedures is that the scope
may damage (perforate) the the lining of the esophagus,stomach, duodenum or colon, specially when there's already a pre-existing pathology which has caused a compromise in the connective tissue of the lining. It could also be a reaction to the medicine
you were administered, prior to the procedure..
But as the previous poster mentioned, this is a reportable incident and you should notify your doctor asap!
Best wishes,
Niko
any adverse reaction to any medical procedure should be reported to your doctor.