Perhaps ask the anesthesiologist if s/he could give you only propofol?
Meeting with the anesthesiologist beforehand is a must, imo. Life changing for me. Turned out I cannot tolerate any gases, versed, etc, and that all drugs used stay in my system about 10X longer than the normal. An anesthesiologist studied me and concluded that I should only ever have propofol and that the drs need to know beforehand how little I require, and carefully monitor me and my breathing during the surgery. Good luck with your procedure.