Considering no sed w/colonoscopy last time propo felt bad for three days don't like fentyl flying overseas three days later?

See below. I think you will be uncomfortable without any sedation. Talk to the anesthesiologist. A blend/mixture of several medications carefully injected will help you tolerate the procedure and not feel hungover after.
Discuss. You will be uncomfortable without sedation. Discuss with anesthesiologist what happened last time. There are many other medications except Propofol which can make your comfortable.