I had some dental work done three days ago and consented to have nitrous oxide for the first time because I've been pain-sensitive lately. It really helped with the procedure, but I've been spacey and nauseated ever since. It seems that the general consensus is that it wears off within minutes, but that doesn't seem to be the case with me. Do we react differently to this drug for some reason? Anything I can do at this point to lessen these symptoms? Thanks!