What is the risk of adverse reaction from fentanyl/versed in egd if i tolerated it during oral surgery and vicodin/valium during balloon sinuplasty?

Low risk: There is less chance of an adverse reaction if you have already tolerated the drugs before. You didn't know how they will affect you before the oral surgery, now you know.

It depends: Contextual factors are very important as you alluded. A prescriber who knows your medical history, use of all medications, alcohol, etc. Is in the best place to start to advise you regarding these mixtures and other options.

Probably no risk: Of an adverse reaction, the risk would be with the administration and monitoring. An allergic reaction to fentanyl is extremely rare and you should tolerate the versed if you did the valium.

Different procedure: Although the drug risks are the same for each procedure (respiratory depression, airway obstruction), different ones may require different amt's of sedation, and the risks are dose-related. Also, edg requires the gastroscope be inserted orally, so local anesthesia of the throat is often added, and airway compromise is a slightly greater risk. If oral surger was ok, this will probably be as well.