I would be very careful - i just refused a gastroscopy and colonoscopy because in Jan i had a very bad reaction to fentanyl and midazolam (used in another operation) - the same drugs they use for these procedures.
It took me a good 3 months to recover. I was debilitated with chronic fatigue, vertigo, brain fog, etc.
I later found out that these drugs are contra indicated with Hypo T and adrenal insufficiency.
My consultant tried to say it wasnt so - but i experienced it first hand and found some info online that corroborated my findings.
2 months after use of the drugs in an op, my cortisol levels had plummeted, which correlates with how i was feeling.