I was awake when they put oxygen tubes in for colonoscopy and endoscopy. I told the anesthesiologist that my right nostril was burning and the sensation was going all the way through the top of my head. She said not to worry, once I m out I won t feel anything. So, I woke up and have been miserable ever since. It is now 1:00AM and am using afrin nasal spray to no prevail. It was the oxygen not the anesthesia that did this. Why would it.?